ML19274E494

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Seismicity Near the VC Summer Nuclear Station,July-Sept 1978
ML19274E494
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 03/21/1979
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SOUTH CAROLINA ELECTRIC & GAS CO.
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ML19274E492 List:
References
TR-79-4, NUDOCS 7903260261
Download: ML19274E494 (66)
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TECHNICAL REPORT No. 79-4 6 JULY-SEPTEMBER 1978 SEISMICITY NEAR THE V. C. SUMMER NUCLEAR STATION by Geophysical Research Department Staff G. E. Clawson, Manager K. F. Veith, Senior Scientist R. D. Phelps, Associate Seismologist Prepared for South Carolina Electric and Gas Company TELEDYME GE0 TECH 3401 Shiloh Road Carland, Texas 75041 March 1979

CONTENTS Page REPORT

SUMMARY

1. IKIRODUCTION 1 1.1 Subject 1 1,2 Instrumentation 1 1.3 Site characteristics 3 2. METHODS 5 2.1 Seismogram analysis 5 2.2 Location technique 5 2.3 Earth model 7 2.4 Magnitude estimation 7 2.5 Reliability estimates 10 3. SEISMIC ACTIVITY 11 3.1 Distribut ion of epicenters 11 3.2 Activity rates and magnitudes 17 3.3 P-to-S velocity ratios 23 4. CONCLUSIONS 28 5. SELECTED REFERENCES 29 APPENDIX 1 - Low noise periods July - September 1978 APPENDIX 2 - Epicenter list July - September 1978 9 -i-TR 79-4

ILLUSTRATIONS Que Page 1 Map showing V. C. Summer power plant, Mont icel to 2 res e rvoir, and microearthquake monitoring array 2 Seismogram analysis data recording form 6 3 Map of local seismic activity, July-September 1978 12 3a Map of local seismic activity with magnitude 1 1.0, 13 July-September 1978 3b Cumulative map of local seismic activity, 14 December 1977 - September 1978 4 Local seismic activity by location, time, and 15 magnitude; July-September 1978 4a Cumulative local seismic activity by location, time, and 16 magnitude; December 1977 - September 1978 Map of regional seismic activity, July-September 1978 18 Sa Cumulative map of regional seismic activity, 19 December 1977 - September 1978 6 Daily number of events and mean magnitude, 24 December 1977 - September 1978 7 Relation between duration and maximum amplitude 25 magnitude scales, July-September 1978 8 Magnitude frequency distribution, December 1977 - 26 September 1978 9 Daily mean P/Sv velocity ratios, December 1977 - 27 September 1978 1 -ii-TR 79-4

TABLES Table Page 1 Site coordinates 3 2 Criteria defining local events 5 3 Earth model 7 4 Amplitude magnitude corrections (C ) 0 s 5 Duration magnitude correction (K ) 0 s 6 Duration magnitude gain corrections 9 7 July 1978 observed event summary 20 8 August 1978 observed event summary 21 9 September 1978 observed summary 22 - i i i-TR 79-4

REPORT

SUMMARY

Results are presented from the analysis and interpretation of seismic data recorded during July, August, and September 1978 by the SCE&G microseismic monitoring array around the 'ticello reservoir in South Carolina. The microearthquake act ivity rate. sear the V. C. Summer Nuclear Power Station averaged about 5.5 locatable events per day during July, decreased to about 3.5 events per day during August, and then increased slightly to an average of 7 events per day during September. Several brief bursts of activity occurred including: 15 events on 4 July, 24 on 10 July, 15 on 30 August, 28 on 15 September, and 30 on 24 September 1978. About 1500 local events were observed with 507 of them being locatable. Three local earthquakes with magnitudes greater than 2.0 but less than 3.0 occurred within 20 km of the plant. The largest a magnitude 2.6 event which occurred within 2 km of was the dan. site on 27 August 1978. The mean event magnitude gradually rose during August and September. The SCE&G array detection capability for local events near the reservoir remained about magnitude +0.5. All of the seismic activity remained in regions already defined by earlier m ic roca rt hqtakes. One major region of act ivity was located on the northern tip of the reservoir. A second concentration extended across the middle of the reservoir at sund 34'20' latitude, and a third extended across the southern end of the reservoir and along the dam site. -iv-TR 79-4

JULY-SEPTEMBER 1978 SEISMICITY NEAR THE V. C. SUMMER NUCLEAR STATION 1. INTRODUCTION l.1 SUBJECT This report presents resu lt s from analysis and interpretation of seismic data recorded near the V. C. Summer Nuclear Power Station in South Carolina during July, August, and September 1978 and includes cumulative information on activity for the period December 1977 through September 1978. This work ycrformed for the South Carolina Electric and Gas Company (SCE6G) under was Order No. SN-10192. The data were recorded by a four site microearthquake monitorirg array operated by SCE6G. The power plant, Monticello reservoir, and the array are shown in figure 1. Also shown are quarries from which artificial seismic events may be observed. The report includes brief descriptions of the seismic ins t rume nt a t ion, site characteristics, and the computational methods employed in the analysis. The observed microseismic activity is shown with maps, graphs, and tables relative to epicenter distribution, activity rates, magnitudes, and P-to-S wave relations. Low noise periods and epicenter lists are appended. 1.2 INSTRUMENT ATION A single vertical Geotech Model S-13 seismometer is installed at each array site. Data are telemetered (via phone line) to a central recording building located near site I where seismograms are produced with four single channel Helicorders, Geotech Model RV-301B. A recording rate of 1.5 mm/sec is used to obtain 24 hours of continuous seismogram on each Helicorder record. A Geotech Model TG-120 timing system with a time mark program produces hour, half hour, 10 minute, 5 minute, I minute (gaps), and 10 second time marks. Timing accuracy, relative to the National Bureau of Standards, is maintained with a WWV receiver and comparator. The seismograph system response peaks near 20 Hz with an approximately 6 dB/ octave fall-of f down to 1 Hz and a sharp cut-off at frequencies above about 25 Hz. F TR 79-4

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1.3 SITE CHARACTERISTICS The locations of the sites in geographic coordinates, as provided by SCE6G, are given in table 1. Table 1. Site coordinates Lat itude Longitude Sits D3J[ Min Sec D33[ Min Sec 1 34 19 54.82 81 17 44.60 2 34 11 34.66 81 13 48.44 3 34 21 05.15 81 27 24.74 4 34 25 43.14 81 12 59.79 Individual characteristics of each site, based on analysis of July, August, and September 1978 seismograms, are briefly discussed in the following paragraphs. Low noise periods (and data outages exceeding one hour) are given in Appendix 1. SITE 1. This is the closest site to Monticello reservoir and to the activity s ou rce re g io ns. The site responds well to seismic earth motion; thus, many small unlocatable microquakes are re c o rd ed. Traf fic noise obscures analysis occasionally, but the dominant noise is caused by inte r fe rence from thermo-stat controls (personal communication R. B. Whorton, 1978). Further analysis of this noise has led to an updated definition of its pattern. Each occur-rence of the noise is characterized by two high frequency pulses of energy, separated by 4 to 5 seconds, followed by a third pulse 1-1.5 minutes after the second pulse. Somatimes the second pulse is not exh ib it ed. Although the amplitude of the noise pulses (2 to 3 nm) is small, the frequent occur-rences and variations in time between the first and third pulse significantly hinder analysis. Site magnification remained a constant 7.5 k at 1 Hz (150 k at 20 Hz) throughout this report period. SITE 2. This is the quietest site in the array with the only noise being low level train noise and some traf fic noise which did not s ignif ica nt ly hinder record analysis. The site does not respond well to high frequency local microcarthquakes. The S phase is the most distinguishable arrival with the P phase being obscured at times. From 10 August to 18 August, the site was inoperative. When the site became operational again, bet ter reso-lution, due to sharper pen strokes, was apparent (this was true for all sites) but the previously reported (Staf f,1979a) increased response had vanished. Site magnification was 7.5 k at 1 Hz (150 k at 20 Hz) except from 21 August through 5 September when it was decreased to 3.75 k at 1 Hz (75 k at 20 Hz). Af ter 5 September, the apparent imp roved response of this site to seismic earth motion was again noticeable. , TR 79-4

( } w, r" SITE 3. This site did not respond well to high frequency local microearth-quakes. The S phase became the dominant phase seen, with P visible only during the larger events. Relative to other sites, amplitudes were smaller than previously observed. Noise hinderance to analysis was minimal during July and August but increased to previously observed levels during September. Site magnification remained constant at 7.5 k at 1 Hz (150 k at 20 Hz) during the period. SITE 4. Relative to its response to seismic earth motion, this is the best s ite in the array. Well defined P and S arrivals are seen. The site observes three distinctly dif ferent types of noise. The first is traf fic noise bursts lasting about 40 seconds. These occur intermittently, being more frequent during daylight hours, and mask most signals present at the time of their occurrence. The second noise type is cultural in nature consisting of periodic spikes at 0.5-2 second intervals and does not hinder record analy-s is. The third type is low level local cultural activity and rarely hinders data analysis. Site magnification was constant at 7.5 k at 1 Hz (150 k at 20 Hz) during the period. i\\ t TR 79-4 d

2. METHODS 2.1 SEISMOGRAM ANALYSIS The Helicorder seismograms for a given day are analyzed for the four sites as a group. Arrival data for common local events at the different sites are entered on the form shown in figure 2. Note that data for all fields will not usually be available for all sites except for larger magnitude events. In addition, events for which there is not enough data to compute an epi-center and periods of low noise are noted. Local events are defined according to table 2; the event is analyzed if one or more of the criteria are met by an arrival for at least one site. Table 2. Criteria defining local events Criteria Local Event .;-P t ime 1 4.5 sec Lg-P time i 10 sec Clear Lg duration i 15 sec (with no visible P) This definition monitors all activity within 50 km of the plant site. It allows the array to monitor potential seismic activity along the Goat Rock fault to the south of the Monticello reservoir while eliminating most of the quarry blast and regional earthquake activity which is of no importance to SCE6G. Quarry blasts within the Monticello reservoir area (figure 1) and between the area and Columbia are located because there is no simple way to distinguish such activity from that which may be of impo r t ance. This activity has been removed from the results presented in subsequent sections of this report by restricting the analysis to events located within 20 km of the V. C. Summer plant site. Thus, the Goat Rock fault area is monitored while the seismicity rates and analysis pertain only to the immediate area of the Mont icello reservoir. 2.2 LOCATION TECHNIQUE The arrival data from figure 2 are processed with program MEHYPO (Johnson, Clawson, and Swanson, 1977) which computes estimates of the event hypocenter, magnitude, and reliability parameters in essentially the same manner as program HYP071 (Lee and Lahr, 1972). The basic location technique employed in the programs is a classical statistical method of regressions analys is commonly called the least-squares of residuals method. The method is common to most modern earthquake location programs. Epicenters are computed only for events observed by three or more stations accause of anbiguities possible when using data from fewer stations. TR 79-4

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2.3 EARTH MODEL The earth medel used in MEHYPO to compute P and S travel time for the central South Carolina region was provided by Dr. P. Talwani (personal communication) and is listed in table 3. A P-to-S velocity ratio of 1.78 is used to obtain S-wave velocities. Table 3. Earth model Thickness P-velocity S-velocity Layer (km) (km/sec) (km/sec) 1 0.5 5.7 3.20 2 30.0 6.2 3.48 Moho 8.2 4.61 2.4 MAGNITUDE ESTIMATION Two methods, obtained from program HYP071 (Lee and Lahr, 1972), are used to estimate event magnitudes. Both magnitudes are the arithmetic means of individual site magnitude estimates and the relations for both methods have been modified to include site correct ions. The first method is based on maximum signal amplitude and is not necessarily calibrated for the South Carolina region. Letting "s" denote site number, amplitude magnitude (AMAG) is given by AMAG = log (A /2) -1.75 + 1.6 log (Rs) - C (I) s s s where: A = maximum peak-to peak amplitude (mp) s R 2=d +h2 3 s s " eP central distance (km) d i h = hypocentral depth (km) C = site correct ion s The second method is based on signal duration and has been modified for use in the South Carolina region following discussions with P. Talwani (personal communication). Duration magnitude (DMAG) is given by DMAG = 2.04 log (D ) -1.87 +.0035 R -K (2) s g s where D = total signal duration (sec); both P and S phases s must be visible K = site correction s TR 79-4

Site magnitude corrections, given in tables 4 and 5, are based on data for the period December 1977 through March 1978 (Staff, 1978d). The duration magnitude corrections (K ) are for site gains of 7.5 k at 1.0 Hz. Cain s corrections have been developed for the duration magnitude corrections for sites whose gain has varied. These corrections are given in table 6 and are to be algebraically added to the corrections given in table 5, when appro-priate. Note the gain correction for site 2 at 3.75 k gain is only an estimation based on previously noted trends. All magnitude data presented in this report are based on the corrected magnitude estimates obtained with equations 1 and 2 and the corrections of tables 4, 5, and 6. Table 4. Amplitude magnitude corrections (C ) s Site Correc t ion (C ) S.D. N_ Comments s 2 1 C1 = .556 +.927 log (R) .709 log (R) .233 1650* R < 4.5 km Ci = .236 .220 1550* R 14.5 km 2 C2 = .137 .256 1546 3 C3 = .018 .182 2012 4 C4= .391 .197 2133 Table 5. Duration magnitude corrections (K )(For gains of 7.5 k at 1.0 Hz) s S it e Correction (K ) S.D. N_ Comments s_ 1 Ki =.382 .1624 R +.00504 R2 .220 1627* R < 4.8 km Ki = .282 .224 1403* R 1 4.8 km 2 K2 = .132 .224 684 3 K3 '.024 .184 1577 4 K4 =.389 .184 2012

  • All data within +1 km of respective break points were used in computation.

_ TR 79-4

Table 6. Duration magnitude gain corrections Gain (k) Site 1.87 3.75 7.50 15.0 1 .547 .344 0.0 2 (.281) 0.0 +.233 The extreme site by site similarity between the constant amplitude and dura-tion corrections suggests a strong correlation between the ef fects of anoma-lies on amplitude and duration. The ef fectiveness of the corrections in reducing the standard deviations of magnitude estimates for the cumulative period December 1977 - September 1978 is summarized below. Amplitude Duration Magnitude Magnitude S.D. N S.D. N Without Corrections 0.442 12554 0.538 9514 With Corrections 0.286 12554 0.280 9514 On a monthly bas is, the corrected standard deviations are: Amplitude Duration Magnitude Magnitude Month S.D. N S.D. N December, 1977 0.373 425 0.311 280 January, 1978 0.299 1930 0.326 1293 February, 1978 0.193 3675 0.213 3121 M a rc h, 1978 0.239 1235 0.213 1015 April, 1978 0.303 1041 0.221 759 May, 1978 0.364 1207 0.319 820 June, 1978 0.351 1213 0.376 875 July, 1978 0.412 440 0.318 639 August, 1978 0.346 302 0.328 378 September, 1978 0.249 609 0.304 811 TR 79-4

2.5 RELIABIL. tY ESTIMATES Program MEHYPO computes a variety of hypocenter reliabili'.y estimates, some of which are also computed by program HYP071. These common estimates are: DMIN - minimum epicenter to station distance, GAP - maximum epicenter to station azimuth window, ERH - standard error of the computer epicenter, ERZ - standard error of the computed depth, and Q - a locat'an quality factor. In addition, MEHYP0 computes a confidence or coverage epicenter reliability ellipse and depth reliability interval. Values given in this report are confidence reliabilities which are based on the vaciance of observed travel-time res iduals. > TR 79-4

3. SEISMIC ACTIVITY 3.1 DISTRIBUTION OF EPICENTERS A complete listing of the 507 events located with MEHYPO for July, August, and September 1978 is given in Appendix 2. All of the events located within or near the array are shown on the local map of figure 3 while figure 3a shows only those e.;9ts occurring with magnitudes 2.1. 0. Note that there were three events which occurred with magnitude 2. 2. 0, bu t none with magni-tude 1 3.0. Figure 3b shows the cumulative local activity for the period December 1977 - September 1978. Because of the concentrations of large number of events, confidence ellipse axes are included with the mapped epi-centers only for events with magnitude (DMAG) 2.0 or greater. Complete reliability estimates are given for all events in the listings of Appendix 2. The latitude and longitude distribution of the local activity is shown as a function of time and magnitude in figures 4 and 4a. Figure 4 shows the July - September data in detail while figure 4a shows the cumulative data for December 1977 through September 1978. They show the sudden increase in activity near the center and at the southern end of the reservoir on December 21 in response to the filling of the reservoir. Activity at the northern end of the reservoir did not increase notably until early February. A lull in activity naar the center of the reservoir occurred between January 25 and 28 followed by very heavy activity from 5 February through 5 March when activity decreased. Activity at the northern end of the reservoir vir-tually ceased about this same time but resumed at an increased rate in mid-March. Additional activity lulls near the center and southern end of the reservoir can be seen in late March, late April and early May, and mid-Augus t. Relative to the seismicity reported for December through June (Staf f,1978a, b,c,d, 1979a) the activity was confined to the areas already defined by earlier events. Other comparisons include: (1) Continued but decreased activity at the northern tip of the reser-voir with all events having magnitudes of less than 1.0. (2) Continued but decreased activity along the east-west trend across the middle of the reservoir with all events having magnitudes of less than 2.0. The activity still appears to be clustered in four areas. The first is at the eastern edge of the reservoir around site 1. The second is in the middle of the reservoir at about 34*20.5'N latitude. Both of these areas were discernable in the January-June activity. The third area was at the western edge of the reservoir. Its activity was most evident during Febru:ry. The final areas developed primarily during June just about 1-lh km to the south of the second area in the middle of the reservoir. . TR 79-4

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k' ,g g, _. . ;7 p P2 s a C:_ q,. r -w + s 1 '*. r. f)l - f '.]y? t v m. Q):y.j !; 2.. ; >( l ' Q.,,. L. 4 Q 6.',,,, p un.mf . J. ', I.. 7 v ;%.h t t .u v -g ....e h a += ,m .i, ( e:.... r. ,.,..;t, g. . -n ~ .f i.: .,f' 3 SC a y j g.; m.m. f~.. mN -4,.- L]f N l._. .i '. 9, p / \\ g 3*',$~ LECDtD ( y, .%. 4- + N -wis's .s-( g Seismograph \\ -( \\, station g w 9 in X=- 'N %*g EP1 CENTER AND MAGN 1TUDE (with 95% confidence ellipse 'w axes if estimated N u<z + + P-2 4 M (. 3 3(M<4 2 4 ( 98 1 mile ,1 km Scale 1:125,000 s/rfe sdao e eds's Figure 3b. Cumulative map of local seismic activity, December 1977 through September 1978 TR 79-4

M <1.5 -t

1. 5 4 M < 2. 0 X

2.0 4 M < 2.5 m .5 4 M 34-25-- t. w a t +. tr' +. r

.). d 7*,."' '.... '". ' i. '.$

i 0 ' *g 5.0.. d 34. ., : e. a ~ f. i!p. y p. g . j I n. y O Z 34 " " " " ' ! " " ' " " i' '" "" " ! " " " " ' i " " " " ' ! ' " '2 " " ' ! ' '" "" " " " "  ! " ' 9 10 20 31 10 20 31 10 20 30 81-25-- W 0 3 F H OI~00~~.. '. b ?- ,,.. I... 3 f*.*.e g..,.

s...

~,.. p m 3 Q {I,{t v( ff f ffff ffffffff ffff fffff ffff ffff ff fffffff ffff ffff f fffff ff f ffffffff f fff ffff f f fffff fff fffff ff f v I I I I I I I I I 10 20 31 10 20 31 10 20 30 JUL AUG SEP Figure 4. Local seismic activity by location, time, and magnitude; July - September 1978 TR 79-4

M < 1. 5 4-

1. 5 6 M < 2.0 X 2.0 s M < 2.5 e 2.5 5 M 34-25--

t g n &. ;( g...i. ; ;,:.. .t :+*s W .t.- 0

s. -

3

,4 i-N,;,)(

+ V H w.t -

.9-ac y

. N.. -{L%. . p;;e. 9'".,,.:.:.?. V ~.. :s .,';_V_$... 3A~20~ ' '.<. V' f. i':.jj"Iig'v]pN:IrM....

.'. ';'.. ' :(p

,+. T. I'

IN I
-: u.

.,..c e W

x..

0 Z fffit f f f f f f it it ff f f f i t f f f f f f f f f f f I f f f f f f f f f fHf f f f f f f f f f f f f 34_j( IV I I I I I I I I I 81-25 DEC SEP W O 3 V H 's E gi 2e-5N N. ' 4/i.'i.5.f l;+F:- i d

y 4 n. r.

0 . :l ,y 3,4 ;; g.1;.,;.,.1, :. J -. I, 4e.,. ',s y ).4 *. ~4,.'.[.- , y..,..s t.,. T c-4..

f

, 1-9 W '5 i t:- 3 Ul3Q jqJ tttt iI til I f t it stiiI t t t r t 11 f r it i t t t r t t it I t t it t t t it t t t it t r it sv I I I I I I I I I DEC SEP 1977 1978 Figure 4a. Cumu lat ive local seismic activity by locat ion, time, and magnitude; December 1977 - September 1978 TR 79-4

(3) Continued high level activity near the reservoir dam with three magni-tude 2.0 or greater events (the largest had a magnitude of 2.6 and occurred on 27 August 1978). (4) Continued but limited activity at the southeast corner of the reservoir. July-September 1978 events located within 50 km of the V. C. Summer plant site are shown on the regional map of figure 5; the cumulative regional activity is shown in figure 5a. Once again, only the confidence ellipses for events of magnitude 2.0 or greater have been shown. The figures show continued activity in the two major quarry areas between the plant site and Columbia. There is no clear indication of activity associated with the Goat Rock Fault, although there is some suggestion of a lineation in the activity which occurs north-east of the fault. This could reflect movement along a buried continuation of the fault beyond the terminus shown in the maps. 3.2 ACTIVITY RATES AND MAGNITUDES Tables 7, 8, and 9 list the locatable and unlocatable local events observed at each site for July, August, and Septembe r 19 78, res pec t ively. About 1500 local earthquakes s e observed over the period. The previously noted decrease in activity continued into July and August with a slight increase in Septembe r. During July, Sites 1, 2, and 4 observed over 95% of the located events, but Site 3 recorded only 88% due to an apparent decrease in the response quality. During August Site 2 was inope ra t ive for a week and the gain was reduced; thus only 85% of the locatable events were observed. The response at Site 3 improved and 98% of the events were observed. Sites 1 and 4 observed 99 and 92% of the events, res pec t ively. During September, Site 3 saw only 93% of the events while the other sites recorded over 98%. . TR 79-4

] A E ~E -.m / %~ + +/( 5 A t', / A / s k s *,/ \\ + / / \\ / / / / / k + \\. 2 A k \\i A 4 } ',\\ { e O +

  1. ,N 3

O / 0 +, g ,., *8 / i ir x + t s,% u + N l s 'r o o I X \\ ON \\, + \\ o. I 0 s s:N a s a. g2 GC s a se 5: i e r 3 S / a ~ e o v a a b n o N 83 g $3,

  • y v

r x x

  • 1 5.*

3 i + ggg r< n * \\< $c3 + g-e c 1 \\ \\ ~ 3 ': a!51 ddy a s -{ %, ~ } y /' F igu re 5 - Map of regionai seismic activity, July - September 1978 . TR 79-4

s 5 \\ o l \\ c+ / + + k O h U> / o x s k 1 / \\ / / + -\\ / / r / / xg / f> 1 g 5 l A l + y l e on / + ia / p p\\ +'g o 8

  • ,s a

z i 3*f V e x u f+', + N l O, \\ o I g ' O N-3 5-k f 0 le j E II ~ o\\ b Nb $ C 5 e f 3 - = - - - e 3 4 4 ~ 3 g O p' 5 1 gi. ~:: + kEI 5 L + \\7 a4; i Ij: j 7 p'4 kq '. x h 3 a:j fu 4 Figure Sa. Cumulative map of regional seismic activity, December 1977 through September 1978 TR 79-4

Table 7. July 1978 observed event summary Located Local Events Unlocatable Local Events Date Site 1 Site 2 Site 3 Site 4 Site 1 Site 2 Site 3 Site 4 1 4 4 4 4 13 0 2 4 2 3 3 2 3 11 0 1 1 3 5 5 5 5 6 0 0 5 4 15 13 14 15 20 2 2 9 5 4 4 3 4 4 0 2 3 6 6 5 5 6 12 1 0 11 7 6 6 5 6 12 1 1 6 8 2 2 2 2 15 1 0 13 9 4 3 4 4 27 1 0 11 10 24 23 24 23 17 8 7 16 11 4 4 2 4 6 1 5 7 12 3 3 2 3 7 0 5 0 13 10 8 10 10 18 1 2 8 14 6 6 6 6 6 2 1 16 15 12 12 12 12 14 3 5 16 16 4 4 4 4 6 1 1 19 17 6 6 6 6 5 1 1 7 18 6 6 4 6 8 1 1 9 19 3 3 2 3 4 3 1 8 20 2 1 2 2 8 0 1 7 21 5 5 3 5 7 4 0 5 22 3 3 2 3 8 1 0 1 23 2 2 2 2 6 0 0 2 24 3 3 3 3 6 2 0 4 25 6 6 2 6 18 1 0 8 26 2 2 2 2 7 1 0 1 27 4 4 2 4 7 2 0 6 28 11 11 9 11 26 3 1 22 29 4 4 4 4 7 5 0 2 30 4 4 4 4 4 0 0 2 31 3 3 3 3 2 0 0 3 TOTALS 176 168 154 175 297 46 39 232 TR 79-4

Table 8. August 1978 observed event summary ocated Local Everits Un.ocatable Local Events Date Site 1 Site 2 Site 3 Site 4 Site 1 Site 2 Site 3 Site 4 1 3 3 3 3 15 1 0 9 2 2 2 1 2 14 2 1 4 3 1 1 1 1 13 0 0 2 4 3 3 3 3 7 1 0 2 5 2 2 2 2 6 0 0 2 6 4 4 4 3 5 3 0 3 7 7 7 6 7 11 2 1 3 8 2 2 2 2 14 1 0 1 9 1 1 1 1 16 0 0 15 10 4 4 4 4 7 0 1 4 11 3 2 3 9 0 0 1 12 5 0 5 5 20 0 0 10 13 2 0 2 2 7 0 0 5 14 1 0 1 1 10 0 0 0 15 2 0 2 2 9 0 1 2 16 1 0 1 1 13 0 1 10 17 0 0 0 0 5 0 0 4 18 2 1 2 2 8 0 0 1 19 2 1 2 2 17 1 1 9 20 2 1 2 2 14 0 1 7 21 2 3 3 3 7 0 0 5 22 1 1 1 1 15 0 0 2 23 9 9 9 9 12 4 0 5 24 2 1 2 5 0 0 1 ^ 25 1 1 1 1 12 3 0 1 26 3 3 3 3 8 2 2 9 27 5 5 5 0 11 3 1 0 28 7 7 7 3 12 0 0 3 29 13 13 13 13 15 0 0 7 30 15 15 15 15 14 4 1 12 31 2 2 2 2 8 0 0 2 TOTALS 109 93 107 100 329 27 11 141 TR 79-4

Table 9. September 1978 observed event summary Located Local Events ___Urdocatable Local Events Date Site 1 Site 2 Site 3 Site 4 Site 1 Site 2 Site 3 Site 4 1 4 3 4 4 11 0 0 5 2 6 6 6 6 2 1 1 4 3 0 0 0 0 10 0 0 4 4 2 2 2 2 3 1 0 1 5 2 2 2 2 3 0 0 2 6 1 1 1 1 5 1 0 2 7 9 9 9 9 6 1 0 2 8 8 7 7 8 6 0 0 4 9 3 3 3 3 10 1 0 5 10 7 7 6 7 12 2 0 6 11 4 4 4 4 6 0 0 3 12 2 2 1 2 16 2 0 3 13 4 4 4 4 10 1 1 / 14 11 11 11 11 8 0 1 2 15 28 28 28 28 20 1 0 12 16 17 17 17 16 25 3 1 16 17 5 5 5 5 13 1 1 17 18 4 4 4 4 7 3 0 14 19 13 13 13 13 10 2 1 20 9 8 7 9 30 0 3 Id 21 4 4 4 4 8 2 0 6 22 3 2 3 3 9 2 0 5 23 20 20 13 19 9 1 1 6 24 30 30 29 30 14 3 8 16 25 3 3 3 3 9 1 0 4 26 5 5 4 5 9 1 0 6 27 5 5 5 5 4 1 1 8 28 4 4 2 4 9 1 0 3 29 5 5 5 5 15 3 0 6 30 4 4 4 4 8 1 0 2 TOTALS 222 218 206 220 301 36 19 168 TR 79-4

Figure 6 chows the number of events and the mean magnitude (DMAG) for each day from December 1977 through September 1978. Activity fell from an average of near 35 locatable events per day during February to 8 events per day by the end of March, then gradually increased to about 20 locatable events per day in the middle of May. During June activity fell to about 8 events per day. This decrease continued to an average of 5.5 events per day during July and to 3.5 events per day during August. September experienced a slight incr2ase to about 7 events per day. Several brief bursts of activity occurred during t'ais report period including: 15 events on 4 J'aly, 24 on 10 July, 15 on 30 August, 28 on 15 September, and 30 on 24 September. The daily rates of these bursts of activity are not significantly lower than the m aximum daily rates observed during the previous four months. The daily mean magnitudes given in figure 6 showed a slight decreasing trend after February Fat have increased during !.ugust and September. Three events occurred with a magnitude of 2.0 or greater, the largest being a magnitude 2.6 event on 27 August 1978. The individual station duration magnitude (DMAG) and amplitude magnitude (AMAC) values, computed as described in sect ion 2.4, for the July-September events are compared in figure 7. A multivariate fit to the data was made. This fit allows error to exist in both the amplitude and duration magnitude estimates. The data yield AMAC = 1.356 + 0.5990 DHAG with a standard devia-t ion of 0.185. The re fe rence line where DMAG = AMAG is also shown. As with the data in previous reports, the slope of the line fitting the data is near 0.6 instead of 1.0 suggesting that the two formulations for magnitude esti-mation are incons is t ent. Figure 8 shows the number of events located within 20 km of the V. C. Summer plant site as a function of event magnitude (DMAG) at 0.1 magnitude incre-ment. Both cumulative (number of events equal to or greater than a given magnitude) and incremental (number of events in a given magnitude increment) va? ues are shown. A linear recurrence curve was fit to the cumulative data points and is also shown in the figure. Its equation is log N = 4.17 - e 1.28 DMAG. Because of the curvature observable in the data, the fit is not regarded as very stable. The array maintains a high detection capability for earthquakes within the array down to about +0.5 magnitude. 3.3 P-TO-S VELOCITY RATIOS The daily average P-to-S velocity ratios for each station for located events within 20 km of the plant site are shown in figure 9. The rat io of 1.78 used for the location program earth model continues to be an excellent average value for the array region. No significant trends are obvious in the data. Much greater scattering is apparent in S it e 1. This is due to the proximity to the seismic activity. Most events have P-wave travel times of less than I second to the site with S-wave times of less than 2 seconds. With timing accuracy of +0.1 second at best, the data precision is near +10 to 15 percent. This is approximately the scatter observed in the velocity ratios. TR 79-4

  • All events located within 20 km. of the V.C. Summer plant site.

(n F 100-ZW> 80-w u. 60-o 40-L ; e h g '[a / w m 20-- 1 0 L"d '1 D EC SEP n G<r O 5 -- v 4-W Q 3-ae 2-HZ I-- hh b/ b 0-] 1 -- t _ Z -2 W DC SEP r 1977 1978 Figure 6. Daily number of events and mean magnitude, December 1977 through September 1978 TR 79-4

  • All events located within 20 km. of the V.C. Stamer plant site.

O q,' 1.336, O.sg "I% g,' ~ IJs, O 4 ~ v

  • I@j (q %q,'N g,,i at i %

Ev b 3 G b D h by Y. 6 T j 2 7 g 37 'Q - / / '3 '8 9 Og Figure 7. Relation between duration and maximum amplitude magnitude scales; July - September 1978 79'4

  • All events located within 20 km. of the V.C Summer plant site.

10000-- INCREMENTAL x CUMULATIVE o ( log N = 4.17 - 1.28DMAG F 1000= e z e W y Ng '~ h.o 100g x xy c x x$ E r X M r m x E x xx 3 x x-z l0 x xo x X X x X X X l - ->NK I i X@ l- -2 -1 0 1 2 3 4 5 MAGNITUDE (DMAG) Figure 8. Magnitude frequence distribution; December 1977 - September 1978 TR 79-4

STATION 1 2. 0-- 2 s L

4. h r Olb ) dh-lj i

d. i J m .,_r r i vi q l "/ r q ' } r' _9 1.5-STATION 2 2. 0-- ~~ L..,q. s,.,A.. ..w. ~u. c.w,.. /A b--d nm t) n ,r f g-iguii 7 N

b gni.5 v 2. 0-STATION 3 il b i

4 A.v.,. &... m.t> h.u m 1, n.s u,r s H L tA, up-i i. in g tp 7i E l 1.5-STATION 4 2. 0-- ~ I m, m... e n h,u M,. L.- A. P A, V,I J r h. 7.,,..,- im r -~. j scy 15f...,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,;,,,,,,,,,,,,,,,,,, DC SEP 1977 19'8 Figure 9. Daily mean P/Sv velocity ratios; December 1977 - September 1973 t 1 TR 79-4

4. CONCLUSIONS The microesrthquake activity near the V. C. Summer Nuclear Power Station decreased, relative to previously observed rates, averaging about 5.5 locat-able events per day during July 1978, 3.5 events per day during August, and 7 per day during September. Normal daily rates were well below these averages which were inflated by several brief bursts of activity at rates exceeding 15 events per day. These high rates are not significantly lower than those observed during the previous four months. About 1500 local events were observed with 507 of them being locatable. Three local earthquakes with magnitudes greater than 2.0 but less than 3.0 occurred within 20 km of the power plant. The largest, a magnitude 2.6 event, occurred on 27 August within 2 km of the dam. All of the activity remained in areas which had exhibited previous seismic activity. TR 79-4

5. SELECTED REFERENCES Johnson, J. L., Clawson, G. E., and Swanson, J. G., 1977, Program MEHYPO with 1977 modifications: TN 3/77 Garland, Texas, Teledyne Geotech, 25 p. Lee, W. H. K., and Lahr, J. C.,1972, HYP071: A computer program for determining hypocenter, magnitude, and first motion pattern of local earthquakes: Open File Report, U. S. Geological Survey,100 p. Staff, 1978a, December 1977 seismicity near the V. C. Summer Nuclear Station: TR 78-1, Garland, Texas, Teledyne Geotech, 19 p. 1978b, January 1978 seismicity near the V. C. Summer Nuclear Station: TR 78-5, Garland, Texas, Teledyne Geotech, 21 p. 1978c, February 1978 seismicity near the V. C. Summer Nuclear Station: TR 78-7, Garland, Texas, Teledyne Geotech, 28 p. 1978d, March 1978 seismicity near the V. C. Summer Nuclear Station: TR 78-10, Garland, Texas, Teledyne Geotech, 27 p. 1979a, April-June 1978 seismicity near the V. C. Summer Nuclear St at ion : TR 79-2, Garland, Texas, Teledyne Geotech, 29 p. . TR 79-4

APPENDIX 1 TO TECHNICAL REPORT NO. 79-4 LOW NOISE PERIODS July-September 1978

LOW NOISE PERIODS, SITE 1, Julv 1978 Noise

Data Outage Date/ Day 1

2 3 4_ _5_ _ft _L _8_ _A LO 11 12 13 L4 15 L6 17 18 19 20 2_1 _22 23 24 25 2_6 27 28 29 30 31 S S M T W T F S S M T W T F S S M T ti T F S S M T tf T F S S M 00 34-O2 06 04 08-Ob 10 E 08 12 i: 8i: 10 co i 14 m O k i T 12 -te 3 6 o m 14 c: w its a* 16 20 le u' ' 20 40 22 42 -24 04

oE5 o.b8 gaMm Ig E 0 u 4 ,U ,u 2 nV 9a 4 w E 2 nV Av 0 1 .A .s D 1 1 e M 3 ga 0 t S 3 h uO 9 S 2 a t 8 a F 2 D 7 T 2 6 W 2 5 T 2 4 M 8 2 7 3 9 S 2 1 2 y S 2 lu 1 J F 2_ 0_ 2 T 2 ET 9_ W 1 I S 8LT S D y 1M 1 O a I D 6 R / S 1 E e P t f 5 a S E D 1 S 4L. F I ON 3 T W 1 O 2 L W 1 1 T 1 Q1 M 1S 8 S es 1F io N 6 T 5 P l 4 T 3 lf 2 S 1 S g0 2 4 G 8 0 a." a' 6 S 0 9 0 G 0 1 1 I 2 1 E b s6;xcQ fe j c

sA m am e% g = s 4 .t no = ,u g_ 4, mv O e. 4 1 n. 1 1 e 5 g 3 a 0 t S u 3 O 9 S a 2 ta 8 F D 2 7 T 2 6 W 2 5 T 2 4 M 8 2 7 3 9 S 2 1 y 2 S 2 lu 1 J F 2 3 0 T 2 ET 9 i W 1 I S 8 T 1 S 71 D y 15 O a I D 6 R / S E e 1 P t 5 a S E D ) S l 4LF I O N 3 I 1 ' W O h L N 1 1 T 1 OL M 9__S 8__S-es L_ F io N 6 T 5_ W 4T 3 M 2 S 1 S 0 S 0 2 4 6 S 0 b 4 0 ~ M ~ O 1 1 1 1 I 2 2 y b y#"~.~>e Eou$m

8: m8i3* 28x i 0 2 0 2 6 E 0 2 4 c 2 2 0 0 ]' 0 P 1 1 1 i 1 M e 3 g a 0 S t 3 u O 9 S 2 a t 8 F a 2 D 7 T 2 6 W 2 5 T 2 4 M 8 2 7 9 3 S 1 2 y 2 S l 2 u J 1 F 2 4 0 T 2 E 9 W T 1 I S 8 T 1 S 7 M D y 1 O a I D RS R / E e P t nS a E D S 4 F 1 I O N 3 T 1 W O 2 W L 1 1 1 T 1 0 M 1 9_ S 8 S es _ F 7 io N 6 T W 5_ il, 4 T 3 M 2 S 1 S 2 4 0 S 0 c H 0 8 0 2 4 - 0 0 0 O 1 i 1 1 2 2 2 [C #ecOk E3Em

8:i y%?5* m$=: t. 2 a c g ^, 2 0 2 n_ 1 1 l i

  • u 2

0 4 n~ 1 e T g 3 a 0 W tu 3 O 9 T a 2 t 8 M a D 2 7 S 2 6 S 2 5 F 2 8 7 4 T 9 2 1 3 N t 2 su 2 T g 2 u A 1 M 2 0 1 S 2 ET 9 S 1 I S 8 F 1 S D y 7 T 1 O a I D 6 R / W 1 E e P t 5 a T E D 1 ,1 i' I S 41M I O N'S I N W I O L 2 S 1 1 F 1 Q T L 9_ W 8 T es 2M io N 6 S 5_ S 4 F 3 T 2 W 1 T 2 6 8 0 2 4 6 e 0 2 _ O 0 0 1 1 1 1 l 2 2 M' EG % k" 6 4$m

LOW NOISE PERIODS, SITE 2, August 1978 Noise

Data Outage Date/ Day 1

2 3 4 5__ft _L _8_ _.9_ 10.11_.12 _11.14 15 J1 12 L8 19 20 21 22 23 24 25 26 27 28 29 30 31 T W T F S S M T W T F S S M T W T F S S M T W T F S S M T W T l 1 I l 1 i i i l 4-I I I I I I i g g I i 1 1 I I l l I i i i I l 04 l l l i j j PE I I I I i I I I I I i l l ,m 1 1 1 1 I i i 1 f I O l l l l I I E 03 l l l l l 12 I 8 C i I i i i i b ll l

i

= i i l l l 1 1 I i l 12 i l l l l 16 0 g E I i 1 1 I I i 0 l l l I l l 1 l 3 I '.i ! I i t i I I I I I ", ,m I I I I I I l i i i i e i i I i i go I i l i I i I i i l i I i l l 20 i i i i i i i I I l l I l i I n, 1 1 I I I l l i i i I i I I I I i l i n, 6,

a#my2B*5I* 4 e. nV 6 4 s a "s AV ,n u W 0 i.. 'A s 's AV 4 1 2 1 e T 3 ga 0 W tu 3 O 9 T 2 a ta 8 1 b 2 D 7 S 2 6 S 2 5 F 2 8 7 4 T 2 9 1 3 W 2 ts 2 u T 2 gu 1_ 1 A 2_ 5 0 3 S ,l 2 ET 9 S 1 I S 8 F 1 S 7 D y T 1 O a I D l 6 R / W I 1 E e P t 51 T a E D S 4 1 I F O 1 N 3 S 1 W O L

2. S 1

1 F 1 Q T 1 9_ W 8 T es 7__ 1 i b o N 6 S JS 4_ F 3 T 2 W 1 T 0 4 G O 2 4 6 4 0 - c C l 1 1 1 1 4 E E::k*E3aW

a5 o. $?3* 3ex 8 g 2 c a 0 2 c 2 n' 0~ 1 1 i j 2 2 o 0 c 1 T 4 ! l w-i I } e 3 g a 0 W t 3 1 ' , =32e1i j! I u O 9 T 2 a t 8 M a 2 I ! I I,E It t I I ! i l D 7 S 2 i! I I ,5 I I a i il !i' 1 1 -it' I I Ij! i i i I 6 S 2 i 1' I i

! I 5_

F 2 8 7 4 T 9 2 1 3 W t 2 su 2 T g 2 u 1_ A M 2_ 0 4 S 2 E 9 T S 1 I S 8 F 1 S 7 T D y 1 O a I D 6 R / W E e 1 P t 5 a T E D 1 S 4 M I O 1 N I S I W O a L S l 1 F 1 QL T i l-9 W L B T es 7__M io N f_ S 5_ S 4 F 3 T 2 W 1 T e 4 8 0 t 4 3 g' C O 0 1 i 1 l 1 2 2 EP *%%k E3sm

e E'45M m:T o* t + a. s 0 2 f 0 2 m. a 4 i 2 2 mv c 0 0 n. p 1 1 1 e 3 ga 0 S t 3 u O 9 F 2 a t 8 T a 2 D 7 W 2 6 T 2 8 7 5 fF 9 2 1 4 S r 2 e b 3 S m 2 e t 2 F p 2 e S T 1 2 0 W 1 2 E 9 T T 1 I S 8 f L5 SD y lSI O a I D 6 S R / 1 E e P t 5 F a 1 E D S 4 T 1 I ON 1 W W 1_ O 2_ T L 1 1 f5 1 Q S L 9 S 8 F es 7_ T io N 6 W 5_ T I I I l Il 1 l ,I f 4 F l I I I l I i1i i 3 S 2 S 1 F 2 4 o 0 2 4 u 0 g0 - c n 1 1 1 l 2 O e8 EOk E*. m 4 '

LOW NOISE PERIODS, SITE 2, September 1978 Noise

Data Outage Date/ Day 1

2 3 4_ _5. _6_ _7_ _8__9_ LQ.11 12 11 14 15 JA 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S 00 04 l I o:- cs I i 04 on l i la i i E CS g: i o k 10 1 7 k 4 11 9 E /A 3 m I a 14 sB g w EY 20 l 1 22 l 1 20 i 43 f I I i _og i I I 24 g

8.P o. $?3* 38x 4 ( 8 0 2 4 c 3 0 2 s 2 4 0 n 3'. 1 1 1 i 1 2 2 O 0 0 1 e 3 ga 0 S t 3 u O 9 F 2 a t 8 T a 2 D 7 W 2 6 T 2 8 7 5 M 9 2 1 4 S r 2 e b 3 S m 2 e t t 2 F p 2 e 1 T S 2 3 0 W 2 E 9 T T 1 I S 8 M 1 SD y 2S1 O a I D 6 S R / 1 E e P t 5 F a 1 E D S 4 T I 1 O N 3 W W 3 O 2 T L 1 1 M 1 QS L 9 S 8 F es 7_ T io N 6 W 5_ T giI l t1 l ti ! I-l 4. M i l II I I i' IIiI 3 S 2 S F 1 4 6 8 0 2 4 6 3 ^ 2 4 00 - 0 0 0 0 1 1 1 1 1 2 2 2-EC *E %k f.3em

8:; g$23 28x ) 4 6 u_ 0 2 4 c s 0 2 c 2 3 0 n_ 1 1 i 2 2 e c c 1 e 3 ga 0 t S 3 u O 9 F 2 a t 8 a T 2 D 7 W 2 I 6 T 2 8 5 1 7 2 F 9 1 4 S 2 re 3 S b 2 me 2 t F 2 pe 1 S T 2 0_ W 4 2 E 9_ T T 1 I S 8 1 1 $ SD y 2 S 1 O a I D 6 R / S 1 E e P t 5 a F E D 3 S 4 I T O 1 N 3 W W 1_ O 2 L T 1 1 1 1 F O_ S L 9S 8 F es 7_ T io N 6 W 5_ T gjlI I .I l I I l 4 1F I ! I I jiI l 3 S 2 S 1 F 0 2 0 3 b 2 H 6 S 0 2 4 C - O am 0 0 1 1 I 2 2 2-iCM O#c 03Em

APPENDIX 2 TO TECHNICAL REPORT NO. 79-4 EPICENTER LIST July-September 1978

EPICENTER LIST July-September 1978 This appendix presents lists of the epicenters and other parameters of located events. Data column headings are defined as follows (if not self-explanatory). Origin-T ime - World Standard Time Depth - Computed depth of the hypocenter; a value of zero indi-cates the depth was restrained to the surface or less than 0.05 km. SDR - Standard deviation of the arrival time residuals. (Set to 9.9 if 10 or greater). NO - Number of phase arrivals used in computing the hypocenter. AMAG - Maximum amplitude magnitude. DMAG - Duration magnitude (set to 9.9 if not measured). DMN - (DMIN) Minimum distance from the epicenter to a station. (Set to 999 if 1000 or greater.) GAP - Maximum epicenter to stat ion c:imuth window. ERH - Standard error of the computed epicenter. (Set to 99.9 if 100 or greater.) ERZ - Standard error of the computed depth. (Set to 99.9 if 100 or greater.) Q - Mean quality factor. 0.95 CONFIDENCE REGION PARAMETERS: AZI - Azimuth of the major axis of the ellipse. AXMA - Length of the major axis or the ellipse. (Set to 999.9 if 1000 or graater.) AXMI - Length of the mi wr axis of the ellipse. (Set to 99.9 if 100 or greater.) DEPTH - Reliability interval for computed depth. (Set to 99.9 if 100 or greater.) -i-TR 79-4, app 2

01 JJ L 1978-30 SEPT 1968 V.C. SUMMER MJCLEAR STATION EPITENTER LIST 0.95 CON 8'IGENfT RFG EVNT DATE ORIGIN-TIME L ATITUDE LONSITUDE D PTH SDR NO AMAG D1AG DMN gap EPH ER7 Q A7I A XM A AYMI DEATH CODE YRMODA HR MIN SEC DEG MIN DEG MIN KM SEC KM DEG KM KM DEG KM KM KM ___._1.7807a1 11154257.7_34 2a.06N_81 17 33W. 2.3 - 1-7- 1.3 -.1 1 128 7 7 R 1G3

2. 5
1. 6 -- 2.2 2 780701 13:21833.6 34 19.45N 81 17.96W 1.4

.0 6 1.0 -1.1 1 125 .2 .? R 114 1.1 1.0 1.0 3 780701 168 1839.8 34 19.71 N 81 18.01W 1.0 .0 6

1. 0 -3. 6 1 123

.2 .29137 .9 .6 .8 4 780701 188141 1.9 34 19.76N 81 18.64W D .1 6 1.2 -3.8 1 126 .4 4 9 149 1.7 1.5 1.9 ._ 5~780702 8219213.6 34 19.59N 81 1M.45W 1.0 .1 6 .8 -0.5 1 127 9 7 R 10G 2.2 1.9 2.9 6 760702 11824816.1 34 19.6 2 N 81 16.87W 0 .1 5

1. 0 -0.1 1 135

.5 O C 162 2.k 2.? O 7 780702 12:50856.2 34 17.37N 81 14.70W 3 .1 4 1.1 1.9 6 160 .6 0 C 60 B.5 7.4 0 8 780703 14823t16.2 34 19.41N 81 18.65W D .1 8

1. 5 -0. 0 2 130

.3 4 8 143 7 .6 1.0 - __ - 9. 78D 70 3.1413 413 4.D. 3 k 17.2 3N 81 19.3kW 2.4 . 2 -- 8 1.4 -0. 3 6 159 .6 2.4 C 38 1.7 1.3 6.6 10 780703 158288 .3 34 19.70N 81 19.60W .4 .1 7 1.7 5 1 127 .3 4 9 165 1.1 .8 1.4 11 780703 198 3843.2 34 20.82N 81 14.16W D .1 7 1.3 .1 3 134 .3 .6 8 162 1.2 .8 1.9 12 780703 20t478 9.0 34 17.54N 81 7.10W D .2 8 2.2 1.4 15 254 .9 0 C 92 2.8 1.3 0 13 780704 2340818.4 34 20.78N 81 19.00W D .1 4 1.1 -:.4 3 250 1.2 0 C 87 23.9 6.4 0 14 780704 6835 15.6 34 2 3.2 0 N 81 1R.87W D .1 5 1.0 -J.4 6 169 .4 0 C 125 1.9 1.2 0 15 780704 8852857.7 34 19.27N 81 19.91W D .2 7 1.3 -3.2 2 133 .8 1.1 9 97 2.7 2.0 3.4 16 780704 98 8 20.2 34 19.77N 81 18.50W .3 .0 7 1.4 .2 1 126 .1 .2 9 158 .3 .2 .5 17.780734 1Et44136.1 34 23.27N. 81 19.07W _ 0 .1 6 1.2 -).3 7 172 .5 1.9 n 151 2.5 1.4 8.1 18 780704 15:57142 9 34 18.34N 81 19.55W 0 .1 8 2.1 1.2 4 148 .5 1.0 8 35 1.4 1.3 2.7 19 780704 16:46 25.3 34 18.29N 81 14.53W D .1 6 1.0 -3.5 4 149 .5 .7 R 11 2.3 2.1 3.1 20 780704 17:54842.1 34 18.7 6 N 81 17.90W G .3 5 1.2 -;.6 2 259 .2 0 C is 1.2 .5 0 21 7807a4 19842823.9 34 19.62N 81 18,35W D .1 6 1.1 -3. 2 1 126 .3 4 9 49 1.4 14 1.7 22 780704 19:42:35.3 34 19.51N 81 18. 31 W 0 .1 7 1.7 .6 1 127 .2 .3 9 145 .6 .6 1.0 23 78 G 70 4 19:47tgi.1 34 19.81N 31 1E.73% 0 .2 7 1.3 -2.2 2 126 .6 1.1 4 168 2.0 1.8 3.5 24 780734 19: 48tc0.6 34 19.6 0 N 81 18.62W 0 .1 7 2.0 1.2 1 129 .2 .4 0 16? .6 .6 1.2 25 783704 19:55831.5 34 14.72N 81 la,31W .2 .1 6 9 -1. 0 2 128 .7 1.1 R 151 3.2 2.7 4.4 26 780704 19:58158.4 34 19.46N 81 16.86W D .1 6 1.3 -3.7 2 131 .3 .4 B 159 1.2 1.1 1.5 27 780704 22:57817.8 34 20.98N 81 *9.84W D .0 5

1. 0 -3'. 7 4 150

.1 0 C 6 .3 3 0 28 780705 01 1841.1 34 19.54N 81 14.47W G .1 7 1.9 1.1 1 124 .3 .4 8 153 .8 .R 1.4 29 780705 28 0851.8 34 21.41N 81 19.86W D .2 8 1.2 -1.1 4 146 .6 1.1 A 165 1.7 13 3.0 30 780705 81558 3.2 34 18.h6N 81 10.73W 2.0 .1 8

1. 8

.5 4 148 .4 1.2 C 24 1.1 .9 3.4 31 730705 23:27823.2 34 19.3 5 N 81 18.3PW 0 .1 5 1.0 -1. 0 1 E41 1.4 0 C 96 8.3 2.1 0 32 780700 48 2334.1 34 20.27N 81 19.61W 0 .2 7 1.9 .5 3 128 .6 1.2 R 172 1.9 1.5 3.* 33 78 0 70 6 10: 49 21.9 34-19.4 9N 81 14.69W 0 .2 5 1.3 . 2 2 130 .9 0 C 142 4.4 3.7 0 34 780706 17:488 8.8 34 18.51H 81 14.83W 0 .0 5 1.3 -3.1 3 256 .2 0 C 162 1.2 .4 0 35 78U706 19:32858.3 34 19.53N 81 19.55W 0 .1 6 1.0 -).8 1 128 .4 .4 B 143 1.9 1.6 1.9 36 7807J6 Zut 11 5.2 34 20.41N 81 17.47W 0 .0 5 .9 -2.7 1 191 .2 0 C 115 1.3 3 0 37 780706 23853829.7 34 22.56N 81 19.71W 0 .1 A 1.8 .5 5 158 .5 1.8 9 112 1.4 1.1 5.0 38 78G707 68 1830.2 34 22.49N 81 1*.81W G .2 8 1.5 -].3 5 157 .6 2.2 C 147 1.7 1.3 6.1 4u} 780707 3 3:55t42.8 34 22.4 0 N 91 18.53W G .2 5 1.1 .2 5 154 .6 0 C 129 3.1 2.2 0 780737 884185J.6 34 19.14N 81 18.43W 0 .1 5 1.1 -1. 2 2 132 .7 6 C 112 3.5 2.6 0 42 780707 17237825.4 34 ~19.83N 81 17.28W 0- .2 5 1.1 .6 1 130 1.0 0 C 158 4.9 3.3-- 0 43 780707 20112 59.8 34 19.62N 81 14.36W 2.0 .1 8 1.5 .2 1 126 .4 .5 R 98 1.2 1.1 1.4 44 780707 20: 24830.5 34 19.63N 81 18.56W 1.6 .1 7 1.3 -).1 1 127 .3 4 8 95 1.1 .8 1.3 45 780708 5: 44:38.5 34 23.25N 81 18.70W 0 .2 5 1.1 -J. 3 6 169 .8 0 C 139 41 2.7 0 46 780708 15:55846.3 34 23.63N 81 in.76W 0 .1 6 .9 -C.4 7 176 .2 .4 a 151 1.1 .6 3.4 47 780709 5:30332.5 34 17. 51 N 81 18.6kW 3.0 .0 6 1.4 -1.1 5 150 .1 .3 9 65 .6 4 1.? 48 783709 19 2814J.1 34 22.55N 81 14.10W D .2 7 1.1 -;. 5 5 160 .5 2.1 C 196 1.5 1.3 6.6 _PAGE-1 TR 79-4, App 2

01 JIL 1978-30 SEPT 1978 V.C. SilM M E R MJCLEAR STATION EPITENTER LIST 0.95 CONFIDENCE grq EVNT DATE ORIGIN-TIME LATITUDE LONSITUDE DroTH SDR NO A M A G D4 A G CM N GAP EDH Eo2 0 A7I aVMA AvMT nEoTH CODE YRM004 HR MIN SEC DEG MIN DEG HIN KM SEC KM DEG KM <M DEG <M <M <M 49 780709 19:55456.9 34 19.77N 81 19.50W 1.8 .0 8 17 .3 1 126 .1 .1 a 40 .2 .? 2 50 7807J9 22854111.7 34 20.14N S1 19.36W 0 .1 5 1.0 -1.5 1 164 .6 0 C 17 3.0 2.2 0 51 780710 2 59:12.1 34 19 7 2N 81 16.74W 0 .1 6 1.0 -1.5 2 136 .3 4 a !?T 1.3 1.g 1.7 52 780710 108 is 9.9 34 17.98N 81 17.65W 0 .0 5 .9 -3.4 4 138 .1 0 C 79 .G 0 53 780710 11:28858.9 34 18.05N 81 2n.19W 3.6 .1 A

2. 3 1.0 5 156

.3 .8 4 30 .9 7 2.P 54 780710 11:29141.2 34 18.55N 81 23. 0 3W 0 .0 5 1.5 0 4 149 .0 0 C 43 .? .2 C 55 780710 11:30123.1 34 18.26N 81 14.73W 1.4 .1 6 1.3 -1.3 4 150 .3 1.? 9 3A 1.2 1.1 5.? 56 780710 11 37128.1 34 18.28N 81 20.01W .2 .0 8 1.7 .5 5 152 .1 .4 R 49 2 1 1.2 57 780710 11:421 5.4 34 18.06N 81 20.54W 2.0 .1 8 2.2 1.1 5 159 4 1.7 R 26 1.1 .A 4.6 58 780710 11:44824.4 34 17.96N 81 20.32W 0 .0 4 1.3 1.9 5 158 .0 0 C 47 5 .4 0 59 780710 11: 49 25.4 34 17.98N 81 29.46W D .1 4 1.3 1.9 6 159 .6 0 C 11 A.7 7.? O 60 780710 11: 53t 1.5 34 18.14 N 81 20.04W 2.0 .1 8 1.8 .2 5 154 .2 .9 A 39 .7 .5 2.6 61 780710 115$st14.9 34 18.31N 81 20.J9W 2.9 .1 6 1 5 -2.1 5 152 .3 .g a 21 1.4 1.0 7.5 62 780710 11:50 46.7 34 18.13 N 81 20.17W 2.9 .0 8 1.6 .1 5 109 .2 5 a lo 4 4 1.3 63 780710 11:51817.4 34 17.93N 91 29.26W 1.5 .1 8 1.4 .6 5 159 .2 1.3 A 35 .6 4 3.7 64 780710 11852 14.6 34 18.16N 91 P0.62W G .1 8 2.1 9 5 159 4 1.7 o 20 1.3 1.0 4.7 65 78071g 11352440.6 34 17.88N 81 20.0GW .8 .1 8 2.G .7 5 157 .2 3.4 C 44 .6 .4 9.4 66 780710 111538 S.5 34 17.89N 81 23.11W 1.8 .1 8 1.9 .1 5 159 .5 2.4 C 39 1.4 1.0 6.7 67 780710 11853817.1 34 18.04N 81 23.21W D .1 5 1.k .1 5 157 7 0 C 26 3.? 2.9 0 68 780710 11855: 3.9 34 17.96N 81 21.14W C .1 8 1.9 4 5 157 .3 1.0 A 42 .7 .6 2.3 69 780710 11:55825.2 34 17.97N 81 20.14W a .2 5 1.3 -2.2 5 147 .9 0 C 30 4.0 3.A 0 70 780710 11155tSJ.6 34 18.J7N 81 20.43W D .1 8 1.9 .6 5 159 .4 1.9 A 30 1.1 1.0 4.7 71 780710 12:50t 3.6 34 22.54N 81 18.84W 0 .0 5 1.C -:.1 5 199 .1 0 C 144 6 4 0 72 780710 13:26127.2 34 18.2 5 N Si 20.19h 2.0 .1 6 1.6 4 5 154 .5 1.6 R 16 ?.? 1.0 7.1 73 78J710 148 2 54.0 34 17.89N 81 20.20W 1.5 .1 8 22 1.1 5 158 .5 3.3 C 3G ' -6 1.2 9.2 74 780710 16:59842.4 34 17.98N 91 20.20W 2.2 .1 6

1. 5 -J. 0 5 157

.2 1.0 9 49 1,1 .o 4.1 75 780711 0855: 7.5 34 19 67N 91 la.52W D .2 4 1.2 -1.6 1 243 2.1 0 C 101 39.4 14.0 0 76 780711 11842148.4 34 19.97N 81 16.94W D .2 5 .8 -0. 9 1 133 .o O C 140 4.4 2.8 0 77 780711 11:44825.9 34 20.17N 81 14.21W 2.8 .1 8 1.4 .3 2 125 .3 5 P 162 .9 .8 1.5 78 780711 16813:37.7 34 20.55N 31 10.72W G .2 8 14 .1 T 13? 6 1.2 a 170 1.o 1.5 3.4 79 780712 18 2136.9 34 20.20N 91 10.82W G .1 6 1.5 7 3 129 .4 4 a 117 2.0 1.V 4.0 80 780712 1 20t20.6 34 19.8 7 N 31 17.3?W 0 .3 5 .9 .2 1 129 .1 0 C 93 3 3 81 780712 11:58 8 24. 8 34 22.7 3N 81 19.13W 0 .1 8 1.5 .3 5 157 .2 .6 R 137 9 .4 137 83 78a713 u321:16.6 34 22.SBN 81 18.T8W 1.3 .1 6 2.3 1.4 10 161 4 7.5 C 170 2.2 1.2 32.4 54 780713 2 10:51.5 34 19.92N 81 14.59W 1.6 .1 6 . 8 -:.9 3 130 .3 .6 a 130 1.2 1.1 2.7 55 780713 3:52: 41.5 34 19.24N 81 20.67W 0 .1 3 .5 3.9 5 214 0 0 C 177 0 0 0 86 78G713 11:34 32.8 34 22.63N 81 18.40W 0 .1 .9 -1.4 5 157 .7 0 C 137 12.0 7.1 n 87 780713 11: 55846.8 34 23.23N 91 lo.40W D .1 5 1.1 -:. 0 7 173 4 G C 136 ?.2 1.5 0 88 780713 12 46345.7 34 20.90N S1 19.86W G .2 6 1.5 .6 3 134 9 1.9 a 111 4.7 3.3 7.* 89 780713 14 36852.9 34 6.4GN 81 7.34W D .1 7 2.G 1.1 14 325 7 0 C 99 P.1 1.8 0 90 780713 168 5822.7 34 2 5.4 & N 81 23.71W 1.2 .1 8 1.8 5 10 232 .5 5.9 0 154

1. 5 8 16.3 91 780713 20: 0149.6 34 17.75N 91 19.41W 0

.1 A 1.6 .1 4 146 .4 .8 8 67 1.1 .a 2.1 92 780713 20:23:54.7 34 20.77N Si 20.17W 0 .1 5 1.4 -1.2 4 137 .5 0 C 11 P.4 1.6 0 93 780714 3:20 20.4 34 25.96N 81 29. 23 W D .0 5 1.1 -1. 3 11 222 .3 0 C 161 1.5 5 0 94 780714 3:35840.7 34 19.64N 81 19.10W 0 .1 8 1.7 3 2 110 .3 .5 a 169 9 7 1.4 95 78G714 19:28113.1 34 2U.32N 91 20. 0 4W D .1 8

1. 6

.3 4 130 .4 7 9 175 1.1 .A 1.9 96 780714 19:31120.5 34 20.48N 81 En.24W 0 1 7 1.4 -0.0 4 131 .3 5 A 173 1.1 .7 1.7 PAGF 2 TR 79-4, APD 2

b1 JJ L 1978-30 SEPT 1978 V.C. SUMMER NJ CLEAR ST ATION EPI 7 ENTER LIST 0.95 CONFIDENCF QFG EVNT DATE ORIGIN-TIME LATITUDE LONSITU9E 07PTH SOR NO AMAG D4AG DMN GAP FDH FR7 0 A7I A YMA AXMI DEPTH CODE YRMODA HR MIN SEC DEG MI N DEG MIN KM SEC Km DEG KM KM nEG KM Kw Kw 97 780714 198422-9.3-34 20.66N 81 20.23W D .1 6 1.3 -;.2 4 136 5 .8 A 163 2.2 17 3.6 98 780714 19:55325.0 34 20.46N 81 20.24W 0 .1 8 1.5 .2 4 133 .? .5 R 173 7 .6 1.3 99 780715 21 0125.6 34 19.85N 81 lo.21W G .1 6 1.1 -;. 4 2 129 .4 .6 4 100 .7 1.6 2.4 100 730715 61 7 5.6 34 20.39N 81 20.22W 0 .1 6 1.0 -1. 5 4 13? .3 .5 9 167 1.3 1.0 2.0 101 780715 6814 30.7 34 20.49N 81 20.20W G .0 7

1. 2 -3. 4 4 133

.1 .2 R 173 5 .3 .8 102 780715 7 15t42.5 34 22.75N 81 14.38W U .1 7 1.5 -1.1 5 159 .2 1.0 9 141 4 .6 3.1 103 780715 88 6358.5 34 2J.38N 81 10.47W .2 .0 8 1.8 .3 1 129 .1 .2 a 176 .3 .3 7 104 780715 88 7325.5 34 20.40N 81 10.4QW 2.0 .0 8

1. 5 -1,1 3 129

.1 .2 9 169 .3 .2 .6 135 783715 17:53255.J 34.21.32n 81 20.50W 4,0 .1 8 2.3 t.1 5 147 .5 1.8 B 2 1.5 1.0 5.0-106 780715 198128 .7 34 20.22N 81 19.94W G .3 7 '. 5 .3 3 129 .1 .2 B 173 .3 .2 .6 107 780715 208 3:50.1 34 20.55N 81 19.83W 1.2 .1 7 5.3 -;.0 2 129 .5 1.8 9 133 1.5 1.3 5.T 108 780715 238 Ot43.b 34 20.38N 81 19.07W 3.0 .0 7 1.4 -1. 2 1 123 .2 .2 R 149 7 5 9 109 780715 23:20843.9 24 20.50N 81 20.05W 1.9 .1 7 1.A t.0 4 133 .4 2.2 B 174 1.4 1.2 7.0 11L 780715 23:26848.4 3s 20.41N 81 10.12W 8.4 .1 6

1. 6 -;. 2 2 128

.4 .9 9 163 1.9 1.4 4.0 111 780716 17:56:47.5 34 20.27N S1 10.17W D .0 8 1.8 4 2 126 .1 .1 A 169 .2 .2 .3 112 780716 19 9tSJ.2 34 20.72N 81 19. 5 0 W G .1 6 .9 -0.7 2 130 .5 .8 B 134 2.3 1.8 3.' 113 780716 2Lt44850.9 34 21.174 81 20.35W D .1 7 1.3 -0.3 5 144 .3 .5 a 172 1.0 .8 1.7 114 780716 208491 1.0 34 21.14N 81 20.66W 0 .1 7 1.6 .1 5 145 .3 1.0 8 1 10 .6 3.3 115 780717 7819833.4 34 20.42N 81 20.23W 0 .0 5 .9 -;.4 4 132 .2 0 C 7 .9 .7 0 116 780717 7829147.6 34 20.48N Si 20.18W D .1 5 .9 -).5 4 133 .3 0 C 7 1.7 1.4 0 117 780717 8854222.1 34 20.81N 81 20. 99 W C .1 8 1.9 .7 5 140 .3 1.2 0 5 1.1 .7 3.4 118 780717 15 35148.9 34 2 3.2 9N 31 1*.44W U .1 7 1.5 .0 6 169 .4 1.4 9 147 1.4 c 4.5 120 ?80717 23:3740.9 34 20. ? O t: 41 14.88W 1.0 .1 7 1.9 .6 T 128 .2 1.9 R 177 .7 6 6.0 121 78a718 0832853.7 34 20.3GN 81 14.25W 3.2 .1 7 1.P 7 2 127 .5

1. 4 9 169 1.9 1.5 4.3 122 780718 11:42218.7 34 20.36N 81 1A 93W D

.2 5 1.0 -0.9 1 155 1.1 0 C 127 6.1 2.7 0 123 780718 168 3:18.6 34 20.R3N 81 19.92W G .1 8

1. 3 -;. 2 2 133

.5 .9 8 156 1.5 1.1 2.5 124 780718 16:52:43.6 34 19.8 5 N 81 1M.46W .3 .1 / 2.0 .9 1 124 .5 8 9 108 1.6 1.4 2.6 125 780718 18:22825.5 34 17.33N 91 7.34W 0 .2 8-2.0 .8 15 252 .9 0 C 95 2.9 1.3 0 126 780718 18 278 7.4 34 19.78N 81 1M.91W O .1 5 1.5 -1.3 2 247 .4 0 C 92 2.2 1.1 0 127 780719 9837839.3 34 19. T' N 81 17.89W .4 .0 6 1.2 -;.5 3 237 .2 .0 C 97 .9 .2 .7 128 780719 21:31812.8 34 19.94N 81 19.91W 1.0 .0 7 1.6 .1 2 126 .2 9 A 178 7 .5 2." 129 780719 21 38441.2 34 19.51N S1 14.19W D .4 6 1.0 -2.4 2 143 1.4 2.5 C 111 7.2 5.2 10.5 130 780720 2 16213.5 34 22.96N 81 1Q.37W G .0 6

1. 2 -;.1 6 168

.2 .7 0 155 1.0 .6 3.0 131 78072G 2s:51:30.2 34 8.25N 81 9.78W D .2 8 21 t.6 10 320 t.2 0 C 174 3.0 2.7 0 132 780721 5 27 7.7 34 19.36N 81 21. 31 W .4 .0 8

1. 5. 1 6 146

.1 .4 8 10 .4 .3 1.2 133 780721 19:20:49 7 34 19.42N 81 17. 3 8 W 0 .1 5 .9-39 1 170 4 0 C 69 2.2 1.4 0 134 780721 2Gs St3J.5 34 6.31N 81 7.49W D .1 8

2. ?

t.5 14 325 1.0 0 C 40 2.5 2.2 0 135 780721 20:27 59.4 34 19.78N 91 19.57H 0 .1 6

1. 3 -3. 4 1 244

.5 4 C 10 0 2.9 .9 1.7 136 780721 21:37:38.6 33 58.26N 81 4.76W 0 .1 8 2.5 1.6 28 334 1.2 0 C 63 3.6 2.1 0 137 780722 68298 1.8 34 19.46N 81 17.27H 0 .2 5 .7 -1.9 1 160 4 0 C 63 4.6 3.4 0 138 780722 128 5235.8 34 19.78N 81 18.29u 1.3 .1 6 1.1 -1.1 1 124 .4 .5 B 111 2.0 1.6 1.9 139 780722 18:29 5.0 34 20.80N 81 14.73W 1.0 .1 8 1.7 .6 3 136 .2 1.6 P 161 .5 .5 4.4 140 780723 58 9 11.3 34 19.85N 81 14.45W 0 .1 7

1. 3 -1.1 3 130

.2 .3 R 49 7 .6 1.0 141 780723 17843i45.4 34 2d.42N 81 20.60W 1.2 .1 6 . 7 -l'. 7 4 133 .6 3.5 9 17? 2.4 2.1 15.0 142 740724 0325823.6 34 20.55N 81 10.69W .1 .J 6 1.3 -1.3 3 132 .1 .3 8 121 6 6 1.1 143 780724 15 28113.7 34 20.43N 81 19.6BW 2.3 .0 7 1.? -1.3 3 131 .1 2 9 164 4 .3 7 144 780724 17:251 4.0 34 2a.38N 81 1%.78W G .1 7 1.6 1.1 2 134 .3 .5 A 11C .9 .8 1.5 PAGE 3 TR 79-4, App 2

01 JJL 1978-30 SEPT ;9' 8 .V.C. SUMMER MJCLEAR STATION LPI7 ENTER LIST 0.95 CONFIDENCF 9FG EVNT D ATE ORIGIN-T IME L ATITUDE LONSITUOE T PTH SOR NO AMAG n"AG DMN Gap E0H ER7 O AZI A YMA AY1I DFDTH CODE YRM004 HR MIN SEC OEG MIN DEG MIN KM SEC <M nEG <M <M

nrr, KM

<M <w 145 780725 1845836.5 34 20.82N 81 19.46W 1.0 .1 8 2.0 1.1 3 134 .3 1.2 a 15T 6 7 3.2 146 780725 1855832.5 34 19.58N 81 1A.33W J .1 5

1. 3 -2. 8 3 250

.5 0 C 92 2.4 1.4 C 147 780725 2:32 23.4 34 18.98N S1 16.43W D .4 6 1.4 .1 3 147 5.4 c.9 0 91 32.8 5.4 4?.7 148 783725 2835119.8 34 19 10 N 91 14.37W D .1 5

1. 3 -;. 6 3 250

.6 0 C 95 3.4 1.3 0 149 780725 3tS51 8.8 34 19.3 4N 81 16.75W D .2 5 1.1 -1.0 ? 142 1.1 0 C 47 5.0 4.2 0 150 780 725 13 t 37 t L9.6 34 20.62N di 10.24W D .1 8 1.5 C 3 132 .4 7 R 161 1.2 1.3 2.0 151 780726 15L16:47.9 34 18.43N 81 20.02W D .2 7 1.7 .6 4 150 .6 1,1 9 69 2.1 1.8 T.4 152 780726 16:231 1.6 34 18.11N 91 2".61W C .3 6 1.4 -;.2 6 159 1.2 4.1 C 21 5.7 4.* 17.8 153 780727 18588 6.3 34 2G.17N 81 16.99W e .2 5

1. 3 -i. 3 1 143 1.1 0 C 135 6.2 3.3 0

154 780727 4f24t34.3 34 17.75N 91 2".66W 0 .1 4 1.3 -2.7 6 261 .9 0 C 89 16.3 5.5 0 155 780727 19:16t29.1 34 25.J6N S1 27.71W J .1 8 2.0 9 9 228 5 1.3 C 15C 1.7 8 3.7 156 750727 20s 182].0 34 17.50N 31 A.27W 0 .2 8 2.1 1.0 16 261 .9 0 C 93 2.7 1.3 0 157 78a728 43 0 11.4 34 19.48N 81 1R.20W 0 .1 7

1. 2 -;. 3 1 127

.5 .5 R 94 1.6 1.2 1.6 158 780726 5:36139.3 34 2C.45N 91 10.56W 2.5 .0 8 1.7 .3 3 1 31 .1 1 a 17* 4 .3 1.0 159 780729 5:36tS6.4 34 19.37N il io.91W 3.6 .0 6

1. 2 -;. 2 3 119

.2 3 9? e 4 .R 1.3 160 780728 68 3 11.1 34 2J.63N S1 23. 0 5 W 0 .3 7 1.6 .1 4 135 1.0 1.7 a 171 3.5 2.4 5.5 161 78J728 78 343a.2 34 19.62N 81 14.43W .3 .0 6 1.5 .1 1 127 .0 .1 3 45 .2 .1 .3 162 780728 78 5:32.5 34 18.2 0 N 81 20.51W 2.4 7 7 1.4 .1 5 157 .7 2.0 C 68 2.T 1.8 6.5 163 783728 7 41857.2 34 19.6 5 N 81 18.34W 0 ,1 7

1. 3

-]. 2 1 126 .2 .3 P 07 9 .6 9 1'4 780728 12:46t55.J 34 19.54N 81 la.13W 0 .2 6 1.3 -).1 1 126 1.0 9 n 107 4.7 3.8 3,7 JA3 780728 168 9817.2 34 18.07N 81 la.26W D .1 6 1.2 -3.1 3 223 .1 0 C 54 .A .2 5 166 780728 19:4881?.4 34 18.22N 31 26.?7W 3.0 .U 6 1.8 1 6 ?S9 4 4 C 01 2.4 .5 1.7 167 780728 23821145.8 34 19.52N 61 21. 2 2 W G .1 e 1.9 .6 5 145 5 1.9 0 6 1.5 1.1 G.C 168 780729 7857t12.6 34 19.92N 81 14.41W .2 .1 7 1.4 .2 3 129 .5 1.0 a 106 1.8 1.4 3.1 169 780729 7857147.2 34 19. 9 5 N 61 10.1GW 0 .1 6 4 .8 2 127 .5 7 9 113 2.5 2.2 3.1 170 780729 93 9437.7 34 20.75N 81 20.14W D .1 5 .9 -?. 2 4 137 4 0 C 22 1.0 1.8 0 171 780729 19121255.5 34 19.37N '81 21.17 W D .1 5 .8 -2. 6 5 147 .J 3 0 10 1.3 1.1 1 172 780730 12:21115.6 34 15.90N 81 14.90W .2 .0 8 1.7 4 4 144 .1 .2 a 2 .3 .2 6 if3 780730 14:14:40.4 34 2v.62N 81 18.92W 3.4 .1 a

1. 2 -2. 3 2 130

.5 7 9 144 1.3 1.1 1.4 174 78073J 14: 35:14.6 34 16 4 9H 91 20.17W c .1 6 1.u .5 5 151 7 1.1 1 9 3.2 ?.7 4.6 175 7e0730 18:43852.5 34 20.3aN 91 2".19W D .1 6 1.C ..A 4 131 6 9 4 161 2.2 2.0 3.5 176 78s731 515o813.1 34 20.35N 81 21.15W G .1 s 1.3 .1 6 142 .3 1.1 1 0 .9 .7 3.1 177 78G731 8856832.2 34 18.2uN 81 14.CCW 2.0 .] 8 14 -:.1 1 130 .2 .4 n 63 .5 4 1.1 178 780731 9: 49847.5 34 19.63N di 19.44W 2.3 .1 7 1.9 .7 1 127 7 .6 A 109 .9 9 2.0 179 780801 13:57 43 6 34 23.53N 81 1*.11W .6 .2 8 2.2 1.1 7 170 7 33.9 C 139 2.2 1.4 cy,q 18u 780801 15:26 30.4 34 22.90N S1 19.77W 2.3 .1 8 1.9 .6 6 164 .3 1.1 9 137 .9 .A 2.9 181 780831 20:32839.J 34 4.52N 81 0.32W 3 .0 8 2.2

1. 4 15 326 4

0 C 64 1.0 7 0 182 7808J2 3:21 55.2 34 20.66N il 2".41W 2.0 .1 8 1.4 .1 4 136 .4 1.2 C 175 1.0 3.4 183 780802 8:34t?3.6 34 23.?4N 31 19.68W .7 .1 6 1.3 -1.0 6 255 1.5 15.7 0 11' 8.4 t.9 71.4 184 780803 5:37851.J 34 19.71N 91 1*.47W .4 .1 7 1.4 -?. 3 1 126 .2 3 9 AS .o .7 1.0 A184 780804 347843.9 34 18.61N 81 20.07W D .1 6 1.0 -).5 4 140 .6 .9 9 28 2.6 2.6 4.0 8184 7808g4 5:18:14.5 24 2 3 18N 81 10.36W 2.5 .1 8 1.4 .2 2 125 .2 4 9 147 .6 6 1.0 C184 7808u4 128428 3.4 34 18.64N 81 20.15W D .0 8 2.0 .4 4 149 .1 .2 e 27 .4 .3 .7 185 780805 6:24127.7 34 22.41N 81 18.28W 2.2 .1 9

1. 3 -J. 3 5 151

.2 .7 9 1'4 .6 4 1.9 186 780805 16: 32834.7 34 17.83N 81 7.13W 0 .1 8 2.3 1.3 15 253 .5 0 C 93 't.6 .7 0 187 780936 2:42822.6 34 20.73N L1 ?.4. 2 4 W D .3 6 1.3 .4 3 210 12.4 10.9 n '4 76.2 4.4 46.5 188 783806 18:25 25.9 34 18 53N 81 lo:26W 3 .1 a 1.4 .0 3 144 .3 .5 a 49 9 .9 1.5 DAGE 4 TR 79-4, App ?

01 J1L 1978-30 SEPT 19'8 Y.C. SUMMER NJCLEAR STATION EPI 7 ENTER LIST 0.99 CONFIDENCE RFG EVNT DATE ORIGIN-TIME LATITUDE LON3ITUDE D?DTH SDP NO AMAG 0*AG DMN 08p E9H ER7 0 A7I A YM A AXMI DEFTH CODE YRMODA HR MIN SEC DEG MIN DEG MIN KM SEC KM dEG KM KM DEG KM <M Kw 189 780806 22 44154.1 34 19.81N 81 18.43W D .1 6

1. 0 -0. 5 1 125

.4 .4 A 124 1.7 1.5 1.7 190 7808v6 23845152.8 34 23.4 5 N 91 24.18W .3 .2 7 1.4 .4 7 204 .7 2.0 C 156 2.8 1.1 6.3 191 780807 1825829.9 34 23.31N 81 24.42W 3.6 .2 8 1.6 .6 6 208 .8 2.1 C 157 P.5 1.8 5.9 192 780807 5t30842.6 34 18.46N 81 14.78W 2.0 .1 8 1.7 .3 4 149 5 1.4 8 22 1.3 1.1 4.0 193 790807 16 41822.6 34 5.29N 81 7.01W D .1 8 2.? t.0 1E 327 1.0 0 C 48 2.5 2.1 0 194 790807 178 7852.6 34 20.20N 81 20.11W 0 .1 8 1.5 3 4 130 .5 9 R 174 1.4 1.1 2.5 195 790807 21334124.0 34 20.50N 81 16.36W 0 .0 6 2.1

1. 3 2 13A

.2 .3 p 145 .R .5 1.7 196 790807 21 50858.3 34 19. 8 8 N 81 16.97W D .3 6 1.1 .1 1 131 5.0 8.7 C 46 70.7 4.1 37.3 197 790807 23 58819.3 34 20.36N 81 21. 0 4 W .4 .1 e 2.2 1.1 5 131 .5 1.8 R 6 1.5 1.1 5.1 198 79J808 0311:20.9 34 26.32N 31 21. 2 5 W D .2 8 1.3 .5 5 134 .6 2.3 A 4 1.9 1.5 6.5 199 780808 208 9829.4 34 24.81N 81 23.64W 0 .2 7 1.9 .8 9 224 1.1 2.9. C 144 4.3 1.7 9.3 200 78 0 809 16:43 t 52. 6 34 20.45N S1 10.76W 1.6 .0 7 1.1 -;. 5 3 131 .2 .5 A 166 .6 .4 127 201 780810 4 46324.6 34 20.23N 81 19.46W .1 .1 a 2.0 9 3 127 .2 4 n 1 .5 .4 1,1 202 780810 10347 17.2 34 17.36N 81 1".27W .4 .1 7 1.6 .3 4 144 .5 1.6 R A2 1.8 1.1 5.G 203 78081J 12845 56.1 34 20.27N 81 14.28W 1.6 .0 6

1. 3. 1 2 127

.0 .1 n 1?3 .1 .1 .3 204 780510 18:3G828.7 33 59.49N 81 ?.04W D .1 8 2.5 1.4 25 134 7 0 C 54 2.0 1.3 0 245 783811 1859236.2 34 18.74N 81 19.75V 2.5 .0 6 1.9 3 4 25? .3 .3 C Q2 1.7 .4 1.2 206 780811 19 12142.4 34 20.28N 81 14.09h 0 .3 6 1.4 .2 2 169 6.5 10.6 0 161 40.2 3.7 45.5 207 780811 23:46211.0 34 20.30N 81 20.23W G .0 5

1. 3

-]. 3 4 177 .3 0 C 4 1.5 .9 0 208 780812 28 81 8.7 34 20.21N 81 18.70W D .0 5 1.5 .5 2 167 .2 0 C 171 1.0 .5 0 209 780812 13:18:53.6 34 16.84N 81 20. 41 W D .1 C 1.5 .0 7 270 1.1 0 C 171 6.4 2.4 0 210 780812 13:19 46.2 34 2 6.11 N 81 27.11W 0 3 4 1.1 -1.2 11 237 2.1 0 C 147 17.5 17.0 0 211 783812 18: 57t44.3 34 23.78N 81 1".04W 1.6 .2 6 2.1 1.7 7 174 .8 F.3 C 143 4.6 1.7 27.0 212 780812 218 3827.6 34 23.18N 81 19.14W D .1 6

1. 7 9

6 165 1 1.1 A 146 1.6 .9 4.7 213 78081J 2816847.6 34 17.89N 81 20. 30 W D .1 5

1. 0 -. 3 5 252

.8 0 C 172 4.9 1.5 0 214 780813 8840834.9 34 18.23N 81 18.48W D .1 5

1. 3 -0.1 3 260

.7 0 C 160 4.1 1.6 0 215 780814 14:59152.7 34 22.57N 81 17.89W C .1 6 1.6 .3 5 151 .3 1.0 B 142 1.5 .9 4.4 216 780815 4t29832.2 34 21.58N 81 19.32W D .1 6 1.4 -2.1 4 147 .m 1.9 R 156 5.0 13 9.1 217 780815 8854827.5 34 23.39N 81 14.24W 0 .1 6 1.9 .9 6 169 .3 1.3 P 147 1.6 9 4.4 218 780816 12830830.5 34 3 3.10 N 81 14.74W b .0 5 1.9 .7 14 309 .4 0 C 174 2.0 1.6 0 219 780818 38 4 26.0 34 19.76N 81 2".1AW .3 .C 6 1.2 .1 4 197 .1 .3 C 176 7 .2 1.1 220 780818 218 8851.9 33 57.32N 81 7.86W 0 .1 8

2. 6 1.6 31 336 1.5 0 C 60 4.6 2.5 3

221 780819 14336853.2 34 22.96N 81 14.18W d .1 6 1.2 -i.3 6 161 .3 .9 R 147 1.4 .A -0 222 780819 20:35111.6 34 19.94N 81 17.94W D .2 6 1.4 .2 0 121 .7 7 9 142 3.3 2.9 3.1 223 78082G 6 501 .2 34 20.48'l 81 1".51W C .1 4 . 9 -;. 5 2 143 .5 0 C 155 7.8 6.2 0 224 780820 13:22135.1 34 18.04N 81 20.68W 1.0 .0 7 1.3 .1 6 160 .1 1.9 R 7 .5 .4 5.6 225 780821 9844829.7 34 18.28N S1 19.63W .0 .0 8

1. 7

.2 4 149 .1 .3 n 55 .4 .3 .8 226 780821 19:31348.7 34 2 5.5 7 N 81 22.66W 1.1 .1 e 2.0 .9 10 234 .3 3.8 0 154 9 4 13.5 227 780821 19 52153.2 34 17.33N 81 20.83W 0 .0 4 ic1 -3. 4 11 145 .1 0 C 4 1.? .o n 228 780822 17 118 .5 34 21.49N 81 10.70W D .1 6 1 2 -:.0 4 146 .2 .5 a 163 1.0 .7 2.1 229 780823 98 4125.8 34 18.3 5 N 81 1R.40W 0 .1 8 1.4 .3 3 139 .2 .4 8 75 7 .6 1.? 230 780823 11850833.0 34 23.36N 61 19.35W 0 .0 5 1.3 .3 6 169 .1 0 C 130 si .3 0 231 780823 15849129.8 34 17.21N 81 7.47W 0 .2 7 2.3 l'. 4 14 251 1.2 0 C 95 4.2 2.0 0 232 780823 16 11:13.4 34 20.43N 81 19.25W 2.7 .2 7

2. 2 1.7 3 129

.7 1.9 P 16 8 2.3 2.0 6.1 233 780323 16:30856.3 34 20.29N 81 14.05W .4 .1 7 1.5 .7 2 126 4 .' B 104 1.4 1.2 2.1 234 780823 178488 9.9 34 2J.48N 81 19.09W .5 .0 8 1.6 .4 2 129 .1 .a 9 17 .2 .2 9 235 780823 22:33tS3.4 34 19 72N 81 20.3 1W D .1 7 1.2 -3 1 5 140 .5 .9 P 179 2.0 1.2 3.0 oAGE 5 TR 79-4, APP 2

01 JJL 1978-30 SEPT 1978 V.C. SUMMER N1 CLEAR STATION EPITENTER LIST 0.95 CONFIDENCF OFG [ ODE YRMODA HRDATE ORIGIN-TIME LATITUDE L O NG I TUDE D?PTH SOR NO AMAG 01AG DMN GAP ERW ER7 0 A7I AYMA SYMI DEPTH VNT C MIN SEC DEG MI N 9EG MIM KM SEC KM DEG KM KM DEG KM KM KP 236 780823 23:28236.0 34 2G.32N 81 18.91W .4 .0 6 1.2 -:.1 2 126 .1 .2 P 129 .5 .4 .7 237 780823 23330854.1 34 20.06N 81 20.79h 1.0 .0 7 1.0 -0.1 5 135 .1 .5 A 1 .5 .3 1.4 238 780824 2159244.5 34 23.*4N 81 18.35W D .0 R . 9 -3. 2 7 170 .2 0 C 136 1.2 .5 0 239 780824 21:29:15.0 34 20.35N 81 16.91W 0 .2 7 2.0 L.4 2 132 .6 11 8 118 2.2 1.6 3.5 240 780825 20157839.5 34 20.12N 81 14.03W 1.0 .1 7 1.9 .7 2 125 .4 7 8 170 1.2 1.1 2.3 241 780826 UI 2: 38.3 34 19.61N 81 17.66W J .1 7 1.3 .1 1 126 .2 .2 n 93 .o 6 7 242 780826 0850824.4 34 19.6 3 N 81 18.99W C .1 6 1.C -:. 2 2 130 .3 .4 9 96 1.5 1.4 1.9 243 780826 38461 .7 34 19.97N 81 18.49W 0 .1 7 1.1 .1 1 124 .4 .5 0 100 1.4 1.1 1.6 244 786827 16: 238 7.7 34 17.99N 81 20.79W G .3 5 2.4 ?.6 6 162 1.5 0 C 17

8. 6 1.9 0

245 780827 10: 58t17.1 34 18.17N 81 20.53W 0 .1 5 2.4 ?.3 5 157 .6 0 C 36 3.2 1.6 0 246 780827 13836:25.0 34 18.64N 81 14.66W .8 .1 6 19 1.0 4 145 1.4 21.6 C 34 8.4 1.9 92.9 247 780827 17:53 30.4 34 18.67N 81 14.92W .5 .a 6 2.1 t.2 % 147 .1 5 9 18 .7 .4 2.1 248 780827 18:11: 46.3 34 18.7 9 N 81 14.99W .8 .1 A

1. 9 1.0 4 146 1.4 20.7 C T2 8.5 2.0 84.9 249 780828 6 41 29.9 34 18.62N 81 20.44W 0

.1 6 1.6 4 5 151 .5 1.1 A 36 3.0 .a 4.7 250 780828 3 4J8 .7 34 18.93N 81 14.87W 7 .1 6 2.3 t.6 4 143 14 22.0 C 32 S. 5 1.8 94.5 251 780828 3:57415.9 34 18.63N 81 20. 0 4W 0 .1 5

1. 5 - 3.1 4 149 4

O C 2 2.0 1.1 0 252 780828 98 4341.3 34 id.77N 81 20.22W 0 .1 5 1.4 -0. 2 4 148 .4 0 C 7 23 1.3 0 253 78G828 14 28856.9 34 18.6 4 N 81 19.97W 0 .0 8 2.1 .8 4 148 .1 .5 8 1 ' 3.0 2.6 0 .4 .3 1.4 254 780828 17: 20854.1 34 6.13N 81 7.21W D .1 8

2. 3 1.4 14 326 1.2 0 C 52 255 780628 18: 248 3.5 34 20.24N 81 18. 81 W D

.1 6 1.1 -:. 3 2 125 .3 .4 P 112 1.5 1.3 1.9 256 780829 7853:48.0 34 20 06N 81 2n. 71 W .0 .1 8 E.0 1'. 3 5 135 3 .7 e 3 .o 7 1.9 257 780829 98 1844.3 34 20.71N 81 1a.94W 1.0 .1 7 2.0

1. 2 2 131

.5 1.1 A 1?C 1.6 1.4 1.6 258 780829 98 3851.8 34 20.53N 81 18.79W 1.0 .1 8 1.8 .9 2 128 .4 .8 9 135 1.0 .9 2.3 259 780829 98 5 36.4 34 20.44N 81 14.01W 1.3 .1 6 1.1 -;. 2 2 128 .4 1.0 B 150 1.9 1.5 4.2 260 780829 9 25 4.8 34 20.47N 81 18.83W .6 .1 8 1.7 .6 2 128 .3 2.2 R 157 .7 .6 6.0 261 780829 16349 11.3 34 20.57N 81 19.88W 1.9 .0 6 1.1 -:.3 2 129 .1 .1 P 148 .3 .3 .6 262 780829 18857 25.3 34 25.259 81 23.54W .6 .0 8 1.9 t.0 1J 229 .2 19.2 0 157 0 .3 53.3 263 780829 19:12:32.7 34 18.52N 81 19.97W 1.7 .1 8 2.2 1.3 4 149 .2 .9 9 19 .6 .5 2.4 264 780829 19: 40 9.8 34 18.SSN 81 1Q.85W G .1 8 2.0 .6 4 148 .2 5 R 24 7 .6 1.3 265 780829 19:53 13.9 34 18.36N 81 20.17 W 3 .1 6 1.4 -:.1 5 152 .5 7 9 34 2.1 1.9 3.1 266 780329 19:5545.1 34 2J.67N 81 lo.S0W .9 .1 7 1.2 - .2 2 131 .5 2.4 n 156 1.9 1.2 7.7 267 780829 21:47 39.0 34 23.4 J N 81 im.64W .6 .0 6 1.4 .1 7 171 .2 27.1 C 142 .9 .5 99.9 268 780829 22 43326.2 34 18.44N 81 20.04W 2.0 .J 8 2.1 .9 4 150 .1 .3 9 38 .2 .2 8 269 780830 7810842.9 34 18.58N 81 19.78W 0 .1 8 2.1 1.1 4 147 .2 .4 9 23 .7 .6 1.2 270 780830 8 48 2.2 34 20.41N 81 20.48W D .1 7 1.3 .0 4 133 .4 .8 R 175 1.6 1.0 2.4 271 780830 St 98 7.4 34 20.65N 81 2n.56W D .1 7 1.2 -3.1 5 137 .3 .5 8 174 1.0 .7 1.6 272 780833 881249.4 34 18.5 2 N 81 14.69W G .J 8 1.5 .1 4 147 .1 .3 R 44 .4 .4 .8 273 78083J 8813:16.1 34 18.43N 81 14.72W 0 .1 6 1.2 -3.3 4 148 .5 .7 R 40 2.' 2.1 3.1 274 78083J 881'?26.1 34 18.42N 81 2".08W .0 .] 8 1.4 -C.1 5 151 .2 .4 9 29 .5 .5 1.1 275 780830 131 'r t 4 0.1 34 17.47N 81 17.96W 1.0 .1 7 1.7 .5 5 145 .4 11 R 78 1.4 8 3.6 276 780830 13823:12.1 34 17.43N di 17.93W 7 .0 8 2.1 L.1 5 145 .2 3.5 C 65 .5 .3 9.6 277 780830 13826840.4 34 18.70N 81 14.93W .3 .1 8 2.1 L.1 4 147 .2 .8 8 2 .6 .5 2.1 278 780830 148208 9.1 34 17.51N 81 im.02W 0 .1 5 1.5 .2 4 145 .5 0 C 77 2.8 1.5 0 2 79 780830 14853813.7 34 17.32N 81 17.90W D .1 8 1.5 .2 5 146 .5 11 A 68 1.7 1.2 3.0 280 780830 16:40:15.2 34 17.32N 81 19.23W 1.5 .1 6 1.5 -3.2 5 149 .3 1.6 C 45 1.4 .8 7.0 281 780830 16t45t27.5 34 18.70N 81 21.33W 0 .1 7 1.7 .3 5 149 .3 .5 R 1 1.1 .8 1.5 282 780830 16:47:29.1 34 23.29N 81 18.20W D .1 7 1.9 .7 6 167 .3 12 R 144 1.1 .7 3.7 PAGE 6 TR 79-4, APD 2

01 JfL 1978-30 SEPT 197 8 V.C. SUMMER N1 CLEAR STATION EPI 7 ENTER LIST 0.99 CONFIDENCE REG EVNT DATE ORIGIN-TIME L ATITUDE LONGITUDE DrPTH SDR NO AMAG D1AG OMN GAP ERH ERZ 0 A7I A XMA AXMI DEDTH CODE YRMODA HR MIN SEC DEG MIN DEG MIN KM SEC K" OEG KH K't DEG KM KM KP 283 783830 17 23 46.4 34 20414N 81 20.42W G .2 6

1. 3 -3.1 4 132

.8 1.7 8 176 4.0 2.5

7. i.

284 780831 5 12 58.8 34 18.48N 81 19.81W 2.0 .1 8 1.9 .8 4 14M .2 .9 R 2 .7 .6 2.5 285 780831 12 48144.u 34 17.27N 81 17.76W 0 .2 8 2.2 1.1 5 145 .6 1.1 0 64 1.7 1.2 3.1 286 780901 4: 15:42.8 34 19.38N 81 18.47W 0 .0 6 1.4 .1 1 129 .2 .3 R 96 1.1 1.0 102 287 7809G1 6:19:25.1 34 19.8 2N 81 14.32W G .1 6

1. 2

-1. 3 2 130 .4 .5 8 146 1.7 1.4 2.2 288 780901 9849 19.6 34 17.83N 81 19.35W D .1 8 1.5 .1 4 145 .3 .5 A 69 8 .6 1.4 289 780901 19:52149.6 34 20.50N 81 20.1JW G .3 5 1.3 .3 4 160 3 0 C 175 1.7 O 290 780902 6:17t34.4 34 22.99N 81 14.07W 0 .0 7 1.3 .1 6 167 .1 .6 9 144 .5 .4 1.9 291 7809J 2 1a 3 32 840.2 34 19.91N 81 19.67W D .0 7 1.2 .0 3 131 .2 .3 R 172 .6 -.4 .A 292 780902 10 36855.5 34 19.73N 81 17.78W 0 .0 5 1.2 -3.2 0 124 .2 0 C 100 1.2 .9 0 293 780902 158 5335.2 34 19.80N 81 19.50W 1.9 .1 7 1.5 .2 3 131 .3 .6 8 165 1.0 .7 1.9 294 780902 22320:56.4 34 19.95N 81 20.00W 2.0 .1 7 1.4 .3 3 132 .4 1.1 8 173 1.4 1.1 3.9 295 780902 23 4:47.6 34 20.60N 81 18.94W 'O .1 8 1.7 .4 2 130 .2 .3 R 153 5 5 .9 296 7809u4 LI4Jt15.8 34 17.47N 81 17.42W .9 .1 8 2.2 1.5 5 141 .3 3.7 C 68 1.0 7 10.4 297 780904 0841 5.9 34 17.20 N S1 17.82W 6 .1 7 1.4 .2 5 147 .3 14.9 C 77 1.3 .R 47.6 298 780905 19:51125.5 34 19.97N 81 20.59W 0 .1 6 1.2 -].1 4 135 .3 .8 R 1 1.8 1.3 3.5 299 7809G5 223 1835.5 33 59.624 81 1.99W 0 .1 8 2.5 1.8 ?Q 335 .Q 0 C 57 2.6 1.6 0 30u 780906 17:26 59.8 34 25.8 9N 81 24.J5W 1.4 .1 8 2.1 1.1 10 24* .3 3.1 C 155 1.0 .5 8.6 301 780907 2:28332.1 34 21.31N 81 20. 30 W D .0 8 1.4 .3 9 24b .1 .2 a 172 .4 .3 .7 302 780907 1283928.5 34 21.58N 81 20.47W 0 .0 7 2.3 ?.0 5 151 .1 .? 9 174 .2 .2 .8 303 780907 138 9843.4 34 21.43N 81 29.61W 0 .2 4 1.1 7.9 5 149 .6 0 C 177 10.1 8.2 0 304 780907 16:21115.0 34 18.11N 81 19.66W 2.8 .2 7 1.6 .2 4 151 .7 1.5 A 2 2.2 1.8 4.6 305 780907 18:45 43.7 34 21.64N 81 20.44W 2.9 .1 8 1.8 .8 5 152 .5 1.5 9 170 1.6 1.2 4.3 306 780907 19: 278 4.4 34 8.26N 81 R.90W G .1 8 2.1 1.5 13 320 1.0 0 C 158 2.5 2.3 0 307 780907 19: 41447.2 34 6.40N 81 6.85W D .0 8 2.3 1.4 14 325 .4 0 C 45 4 8 0 308 780907 218 48 4.8 34 20.1GN 81 18.76W 3.0 .0 7 1.5 .1 2 124 .1 .2 B 130 .3 .3 .7 309 780907 222 2:22.6 34 2.22N 81 1.20W D .1 8 2.5 1:. 6 24 332 1.4 0 C 55 4.0 2.M 0 310 780908 4 50t48.5 34 19.99N 81 18.58W 1.1 .0 6 1.1 -3.5 1 124 .2 .3 8 116 .8 .7 1.2 311 780908 5:32152.1 34 20.31N 81 18.04W 0 .1 7 1.4 .3 1 122 .2 .3 R 116 7 .6 1.0 312 780938 12811:57.2 34 19.85N 81 17.42W 0 .1 5 1.1 -1.5 1 128 .3 0 C 156 1.3 1.1 0 313 780908 168 3 42.5 34 25.28N 81 21.87W D .1 8 2.4 1.5 9 232 .8 2.1 C 153 2.8 1.2 5.9 314 780908 178 3:59.5 34 18.28N 81 19.79W G .1 6 14 .1 4 151 .6 .9 A 56 2.7 2.3 3.7 315 780908 17t43311.5 34 20.42N 81 20.41W .9 .1 6 1.4 .2 4 174 .7-5.2 C 166 4.2 -1.0 22.3 316 780908 2C:15:27.9 34 17.81N 81 7.51W 5.0 .3 8 2.3 1.5 15 250 1.6 4.2 C 92 9.4 2.4 11.6 317 780908 21: 26155 9 34 2 0.01 N 91 16.64W 1.6 .0 7 2.0 1.3 2 137 .1 .5 8 106 .4 .3 1.5 318 780909 6:18:13.4 34 20.00N 81 20.83W 3.1 .1 8 1.2 .0 5 136 .2 .6 9 6 .7 6 1.7 319 78J969 6:49245.3 34 22.69N 81 1A.14W 0 .1 5 .9 -1.6 5 157 .3 0 C 120 1.6 .9 0 320 7809J9 7 15t14.5 34 22.72N 81 19.04W 0 .0 5 .9 -3.5 5 156 .2 0 C 120 .8 .R 0 321 780910 2335326.7 34 17.3 2 N 81 19.03W 0 .1 7 1.4 .2 5 147 .3 5 9 76 1.3 8 1.7 322 780910 68 B:12.0 34 20.02N 81 17.62W 0 .2 7 1.7

1. 0 0 125

.8 .9 9 105 2.7 2.2 2.7 323.780910 11:46134.8.34 21.26N 81 20.42 W .4 .1 8 2.0 .9 - 5 146 .3 1.2 R 2 1.0 .7 3.4 324 780910 13:31828.1 34 19.67N Si 16.57W 0 .3 6

1. 0 -0.1 2 138 3.5 6.7 C 95 21.0 3.8 28.9 325 780910 14: 29 53.1 34 19.79N 81 17.68W 0

.1 7 1.7 .4 0 129 .4 .4 8 99 1.3 1.1 1.3 326 780910 17:59329.7 34 19.73N 81 17.21H 0 .0 6 1.4 .2 1 131 .2 .2 R 96 .8 .5 1.0 327 780910 21:15 54.7 34 23.42N 81 14.12W 1.2 .1 8 1.6 .7 7 174 .2 2.2 C 149 .6 .4 6.1 328 790911 6 32827.6 34 21.33N 81 20.32W 2.2 .1 C 2.2 1.7 5 147 5 1.7 9 179 1.4 1.1 4.6 329 790911 98381 2.5 34 23.11N 81 18.69W 0 .2 5

1. 0 -C. 2 E 167

.7 0 C 132 3.4 2.2 0 PAGE-7- TR 79-4, APD 2

01 JJ L 1978-30 SEPT 197 8 V.C. StfMMER MJCLEAR STATION EPI 7 ENTER LIST 0.95 CONFIDENCF RFG EVNT DATE ORIGIN-TIME L ATITUDE LO NG IT U D E D PTH SOR NO AMAG 04 AG DMN GAP ERH Eo7 0 47I AXMA AXMT DEATH CODE YRMODA HR MIN SEC DEG MIN DEG MIN KM SEC KM DEG KM KM OFG KM KM (P 330 790911 10: 41 47.6 34 19.8 2 N 81 14.70W .6 .1 8 1.8 .9 3 132 .5 18.9 C 17 1.4 1.3 52.5 331 780911 21 31849.3 34 20.26N 81 16.66W 0 .1 7 2.0 1.4 2 136 .2 4 R 124 7 .6 1.2 332 780912 4:48 21 34 19. 9 2N 81 17.30W 0 .2 6

1. 0

.2 1 129 .6 7 R 101 2.9 2.0 3.7 333 780912 4:59 56 8 34 20.33N S1 18.49W 0 .1 5 1.3 .1 1 244 1.5 0 C 96 9.0 1.9 6 .4 334 780913 18 4 11.3 34 23.03N 81 1R.61W 0 .1 6 1.0 -1. 3 6 165 .3 1.2 9 149 1.5 .9 5.0 335 780913 9 10857.7 34 22.98N 31 la.62W .4 .0 6 1.2 -!.1 6 162 .1 5 R 147 6 .4 2.1 336 780913 1083484S.8 34 22.97N 81 14.06W 0 .0 6 1.2 -;.2 6 167 .2 7 9 150 4 .5 2.9 337 780913 15 44825.2 34 21.6CN 81 20.15W D .2 5 . o -;. 4 5 151 .8 0 0 163 3.5 1.0 0 338 780914 08 0 56.0 34 20.86N 81 14.96W G .1 8 1.7 .9 3 134 .3 .5 B 131 7 .7 1.3 339 780914 0127 55.9 34 20.49N 31 20.73W D .0 7 1.2 -3.2 5 135 .2 .3 n 175 .6 .4 .9 340 780914 4 49157.2 34 20.73N 81 19.41W .9 .0 6 1.2 - .1 2 129 .1 .2 R 124 .3 .2 7 341 780914 6 40 16.7 34 20.80N 81 10.01W 0 .1 8

1. 3 -3.1 3 133

.3 .5 9 154 .8 .8 1.5 342 780914 78 1822.6 34 2J.42N 81 1R.76W 0 .0 A 1.3 .1 2 127 .1 .2 B 148 .4 .3 .6 343 780914 101498 7.2 34 20.46N 81 20.50W .1 .0 8 1.5 .4 5 141 .2 .6 A 4 .5 4 1.7 344 780914 lit 08 6.4 34 21. 0 8 N 81 20.51W .1 .0 7 1.3 .1 5 143 .1 .4 9 179 4 .3 1.4 345 780914 11137 15.1 34 21.14N 81 20.36W D .1 8 1.3 .3 5 144 .3 .6 9 174 .9 .7 1.7 346 780914 19:40443.9 34 18.41N 81 20.25W .0 .0 8 2.0 .9 5 152 .2 .4 R 26 .4 .4 1.0 347 780914 20:28131.9 34 25.25N 81 23.90W .6 .0 8 2.0

1. 3 9 232

.1 9.6 0 155 4 .2 26.6 348 780914 238 6 34.5 34 17.76N 81 10.61W 0 .1 7 1.4 .5 5 155 .3 .9 R B1 1.0 .7 2.9 349 780915 it21:32.3 34 18.31N Si 10.84W D .1 8 2.3 1.5 4 151 .5 .9 8 46 1.3 1.1 2.6 359 780915 185G*12.4 34 18.23N 81 10.94W .0 .2 8 2.3 1.7 5 152 .5 1.3 A 43 1.5 1.3 1.4 351 780915 1851 54.0 34 17.89N 81 20.29W 1.7 .1 8 2.2

1. 4 5 159

.2 1.4 C 17 .7 .6 3.8 352 783915 28 1812.6 34 18.41N 81 20.14W 3.0 .1 6 1.3 .0 5 152 .5 1.6 A 37 2.1 1.9 6.7 353 780915 7:18121.9 34 20.86N 81 20.46W D .1 7

1. 3

.1 5 140 .5 1.0 R 175 1.9 1.4 3.1 354 780915 12:288 1534 18.32N 81 14.85W 2.0 .2 7 2.3 ?.1 4 151 .9 6.G C 41 2.9 2.4 19.0 355 780915 12:28826.8 34 18.19N di 19.94W 0 .0 9 2.0 .9 5 153 .2 0 C 88 .7 7 0 356 780915 12 34 40.2 34 18.51N 81 14.62W 3.4 .1 8 2.3 L.4 4 147 (f' .4 8 3G .6 .5 1.2 357 780915 12:35 25.6 34 18.6 8 N 81 20.06W D .0 6 1.5 .2 4 146 .1 .2 9 47 .6 .5 8 358 780915 13:12:41.5 34 18.13N 81 10.98W 4 .1 6

1. 3 -3. 2 5 154

.2 8 n 62 1.0 1.0 3.3 359 780915 14 421 .2 34 18.37N 81 14.72W 1.4 .S 8 2.0 .9 4 149 .1 .7 9 35 .4 .3 1.9 36a 780915 14 54t26.2 34 13.55H S1 20.03W 0 .0 6 1.2 -J.1 4 149 .1 .1 A 30 4 .3 5 361 780915 16 15:25.6 34 18.19N 81 la.50W .1 .0 8 1.6 .1 3 140 .1 .3 8 76 4 .3 .9 362 780915 16 20:41.0 34 18.53N 81 20.11W .3 .0 7 1.4 -1.1 4 150 .1 .5 9 175 .5 4 1.7 363 780915 16:21132.5 34 18.16 N 81 20.23W 8 .1 6 1.4 .2 5 155 .2 2.8 C 72 .8 .6 12.1 364 780915 16:39:13.4 34 23.0 7N 81 10.10W 2.0 .1 7 1.4 .3 6 168 .2 .9 9 146 .9 .6 3.0 365 780915 17 28146.1 34 18.7 4 N 81 19.61W 3.8 .0 8 2.3 1.8 4 144 .1 .1 A 27 .2 .2 4 366 780915 188 7829.5 34 18.21N 81 14.97W 2.0 .0 8 1.9 9 5 153 .2 7 A 44 .5 4 1.9 367 780915 20:441 4.5 34 16.29N 31 lo.9CW 2.5 .1 8 1.8 .5 4 151 .3 8 8 48 8 7 2.2 368 780915 20144826.9 34 8.45N 61 4.84W 0 .2 8 2.1 1.3 10 318 1.3 0 C 164 3.4 3.0 0 369 780915 218401 7.7 34 18.10 N 81 19.97W .9 .1 8 2.2 1.2 5 163 .2 2.0 B 21 .5 .4 5.9 370 780915 21: 448 1.1 34 17.9 9N 81 19.93W. 2.0 .1 8 2.3 1.7 5 155 .3 1.2 8 33 .8 .6 3.3 371 780915 21: 49154.5 34 18.0 8N 81 lo.89W 1.0 .0 8 2.0 .9 5 154 .2 .6 R 49 .4 .4 1.6 372 780915 22 49831.9 34 18.21N 81 19.70W 0 .1 8 2.0 1.2 4 151 .3 .5 R 42 .7 .7 1.4 373 780915 238 1112.8 34 18.3 8N 81 20.03W D .1 7 1.6 .5 5 151 .3 .6 9 66 1.1 .9 1.9 374 780915 23:30 8.9 34 18.17N 81 20.23W 0 .1 5 1.2 -:.3 5 155 .3 0 C 49 1.6 1.4 0 375 780915 23:58 29.5 34 17.9 9 N 91 19.9CW 1.4 .1 8 2.1 1.2 5 155 .2 1.3 a 18 .6 .5 3.7 376 780915 23:58157.0 34 18.29N Si 29.23W 2.1 .1 7 1.5 .2 5 154 .4 1.4 8 57 1.5 1.3 4.6 PAGE 8 TR 79-4, APP 2

01 JIL 1978-30 SEPT 19'8 V.C. SUMMER NJ CLEAR ST ATION EPITENTER LIST 0.95 CDNFIDENer REG EVNT D A TE ORIGIN-TIME L ATIT UD E L ONG IT U DE D? PTH S DR NO AMAG DIAG DMN GAP ERH ERZ 0 A 7I A XMA AxMI DEATH CODE YRMODA HR MIN SEC DEG MIN DEG MIN KM SEC KM DEG KM KM DEG KM KM KN 377 780916 01 2138.0 34-18.14N 81 19.84W 1.6 .1 8 1.9 .8 5 152 .4 1.8 8 41 1.1 .9 5.1 378 780916 ct25 16.4 34 20.09N 81 20.08W 30 .1 8 1.6 5 4 131 .3 .7 9 1 9 .8 1.9 379 780916 18198 3.3 34 18.21N 81 2n.15W 1.3 .0 8 1.7 .5 5 154 .2 1.1 B PR .5 .4 3.2 380 780916 1854129.4 34 18.42N 81 20.29W 3.5 .1 8 1.8 .7 5 152 .4 1.0 0 34 1.2 1.0 2.8 381 780916 3:17:29.9 34 20.76N 81 19.08W D .1 6 1.1 =). 2 3 133 .3 .4 R 117 1.2 1.1 1.8 382 780916 3 438 5.8 34 20.54N 81 10.23W .2 .1 B 1.7 7 3 130 .3 7 a 3 9 .A 1.9 383 780916 5811834.2 34 18.32N 81 20.14W 7 .0 8 1.8 .8 5 153 .1 2.7 C 34 .3 .2 7.6 384 780916 8836319.4 34 21.00N 81 19.89W G .1 8 1.9 1.1 3 135 .4 .9 8 159 1.1 1.0 2.1 385 780916 lit 42 6.5 34 18.54N 81 19.7AW G .2 8 2.2 1.5 4 147 .7 1.3 C 29 1.9 1.6 3.6 386 780916 16:33821.8 34 .17N 81 2.30W 0 .2 8 2.7 ?.0 28 334 1.5 0 C 53 4.4 2.7 0 387 780916 1981Gt28.5 34 17.74N 81 20.24W 0 .1 8 1.9

1. 0 6 160

.4 1.6 B 43 1.2 1.1 4.4 388 780916 19:59: 3.9 34 17.82N 81 20. 36W 1.2 .1 8 1.5 .4 6 160 .4 4.0 C 34 1.3 1.0 11.0 389 780916 21 40853.4 34 18.49N 81 20.14W D .0 5 1.6 4 5 151 .2 0 C 43 8 7 0 39L 780916 22 18135.0 34 21.28N 81 20. 33W 0 .0 8 1.6 7 5 146 .1 .2 R 173 3 .3 .6 391 780916 22:23:16.8 34 20.97N 81 20.28W 0 .1 7 1.2 s.2 4 141 3 .5 B 5 1.1 7 1.6 392 780916 22:39139.1 34 21.224 81 1R.29W G .2 7 1.4 .2 3 135 4 .3 9 94

1. 7

.4 29 393 780916 238 3:26.4 34 21.25N 81 20.10 W D .0 7 1.4 .2 4 144 .1 .1 4 169 .2 .1 .4 394 780917 1828t11.0 34 21.64N 81 20. 38W 0 .2 6 1.1 -1. 2 5 152 .6 2.4 C 165 2.9 1.9 10.2 395 780917 1828823.7 34 21.53N 81 20.27W 2.0 .1 8 2.1 1. 5 5 149 .2 .9 9 0 .7 .5 2.4 396 780917 35401 6.2 34 18.38N 81 20.24W D .1 8 1.9 1;.1 5 153 .5 .9 9 27 1.4 1.1 2.5 397 780917 15 12:57.6 34 18.13N 81 19.94W .4 .1 8 1.7 .7 5 153 .3 1.G B 37 7 7 2.9 398 780917 15:19:36.3 34 2 0.0 6N 81 2n.25W 0 .3 6 1.5 .1 4 132 1.1 1.7 8 167 5.4 4.3 7.5 399 780918 1136817.5 34 18.67N 81 14.97W 0 .1 8 2.2 1.4 4 147 .3 .5 R 33 .8 .7 1.5 400 780918 1148 28.0 34 20.38N 81 10.48W .3 .1 6 1.1 -:. 2 3 129 .4 .7 9 144 1.8 1.6 2.4 401 780918 3110129.6 34 26.21N 81 19.78W 2.9 .0 7 1.8 .8 3 128 .1 .3 A 179 .3 .3 1.0 402 780918 5841818.9 34 18.45N 81 20.41W .7 .1 6

1. 3 -3.1 5 153

.2 3.5 C 10 9 7 14.9 403 780919 08 4t30.2 34 18.23N 81 20.21W .1 .1 8 1.4 .1 5 154 .3 1.1 B 17 .8 .7 3.0 404 780919 08 6137.7 34 23.17N 81 18.66W D .1 5 1.4 -3. 0 6 168 .5 0 C 136 2.5 1.6 0 405 780919 3344847.3 34 21.39N 81 20.18 W 0 .0 8 2.3 1.9 5 147 .2 .3 8 173 5 4 .9 406 780919 481546.7 34 18.64N 81 20.11W 1.0 .0 6 1.3 .0 4 149 .2 3 9 22 1.0 .9 3.' 407 780919 6:39 25.0 34 21.14N 81 20.43W 3.5 .1 A 2.1 10 5 144 .4 1.0 A 178 1.2 .9 ?.7 4u8 780919 88 7:30.9 34 21.63N 81 20.45W G .1 8 1.3 .2 5 152 .2 7 R 174 .5 .4 1.9 409 '80919 8856843.0 34-19.51N-81-20.11W 7.5 .2 8 2.4 ?-.1 4 138 6 1.0 a 23 1.8 1.6 2.7 410 780919 9823113.2 34 21.6 0 N 81 19.98W D .0 8 1.3 .1 5 149 .2 .3 R 163 4 .4 4 411 78J919 118263 8.0 34 21.61N 81 20.02W 0 .0 8 1.2 .1 5 150 .1 .2 R 163 .3 .2 5 412 780914 12829826.7 34 20.15N 81 19.42W 0 .0 8 1.4 .2 3 127 .2 .3 8 171 .4 .4 .8 413 780919 13:36337.1 34 21.26N S1 20.69W 0 .1 7 1.4 .2 5 147 .2 4 9 177 .9 .6 3.0 414 780919 19:44 3.9 34 20.73N 81 20.5AW 2.2 .1 7 2.1

1. 4 5 138 3

1.6 B 176 1.1 .P 5.0 415 78G919 20: 32159.5 34 19.53N 81 19.02W .4 .1 6 1.2 -).4 1 125 .S .5 9 101 2.3 1.9 2.1 416 780920 18298 9.0 34 19.73N 81 18.5GW .2 .0 6

1. 3

-1. 3 1 126 .1 .1 B 100 .3 .3 .4 417 780920 4: 49 2 31. 3. -34 19.8 3 N 81 16.81W D .3-S 4 -). 6 1 135 1.1 0 C 152 5.2 3.9 0 418 780920 68308 7.4 34 18.35N 81 14.55W 0 .1 5 1.1 -1.2 4 249 1.1 0 C 167 6.6 1.0 0 419 780920 11:118 4.0 34 20.29N 81 20.50W 2.1 .2 7 1.3 -).1 4 131 .4 1.3 C 173 1.4 1.0 4.1 420 780920 11821:58.9 34 19.93N 81 17.99W .2 .0 6 1.4 .0 0 121 .1 .1 8 98 .6 .4 .6 421 780920 18:39853.5 34 17.6 7 N 81 9.00W .7 .3 8 2.0 1.3 14 2k6 1.5 98.5 0 91 5.2 2.3 99.9 422 780920 18:50851.8 34 19.99N 81 16.94W L .1 7 2.0 1.2 1 134 .4 .6 8 107 1.3 1.1 2.1 423 780920 Zus49: 8.5 34 18.86N 81 18.80W 6.5 .2 6 2.3 1.4 3 137 1.1 2.5 C 87 5.5 3.8 10.7 PAGE -9 TR 79-4, APD 2

01 JJL 1978-30 SEPT 1978 V.C. SUMMER NfCLEAR STATION EPI;ENTEP LTST 0.95 CONFI9ENCE REG EVNT DATE ORIGI9-TIME LATITUDE LON3ITUDE DEDTH SDR NO AMAG D*AG DMN GAP EDH ERZ 1 A7I A XM A AXMT DEPTH CODE YRM00A HR MIN SEC DEG MIN DEG MIN KM SEC KM DEG KM KM OEG KM KM KP 424 780920 25850832.2 34 18.47N 81 19.95W D .1 6 1.8 .5 3 246 .7 .4 C 95 4.1 .9 1.7 425 780921 118 3837.2 34 20.37N 81 20. 0 3W 2.0 .1 8 1.9 .8 4 131 .E .9 9 7 .7 .5 2.4 426 780921 12:13820.5 34 2 0.1 1 N 81 19.57W 3.3 .1 7 2.1

1. 5 3 128

.3 7 8 180 .8 7 2.3 427 780921 128S8822.6 34 21.65N 81 20.39W 0 .2 8 1.6 .4 5 152 .7 2.7 C 173 2.1 1.7 7.5 428 780921 218558 8.2 34 1.98N 81 G.05W D .2 8

2. 6 1.6 22 331 2.3 0 C 56 6.5 4.2 0

429 780922 G847844.2 34 19.97N 91 17.63W D .1 6 1.4 .1 0 125 .4 .4 A 107 2.0 1.4 1.7 430 780922 78368 2.5 34 18.01N 81 19.?8W 0 .1 6

1. 2 -;. 2 4 142

.7 1.0 0 74 3.4 2.7 4.5 431 78G922 18 53812.5 34 21.85N 81 20. 7 5W D .G 6 1.3 -3.1 6 157 .1 .3 9 172 .5 .3 1.4 432 780923 3 26854.7 34 19.85N 81 2n. 50 W 0 .s 6 2.0 1.0 4 166 .3 .6 R 32 2.0 .3 2.4 433 780923 8818t15.3 34 2 0.19 N 81 20.36W 2.6 .0 8 1.2 -C.1 4 131 .1 .2 8 2 .3 .2 7 434 780923 8837 13.6 34 21.47N 81 20.77W 2.5 .2 7 1.0 -).2 5 151 .7 2.7 C 172 2.6 1.9 8.5 435 780923 9 17821.6 34 19.71N 81 21.28W 0 .1 7 1.1 .1 5 142 .2 .9 9 14 .9 .6 2.9 436 780923 1Gt 72 1.6 34 20.51N 91 19.25W G .1 6 .9 -3. 4 3 130 .5 .9 8 148 2.6 2.1 3.7 437 780923 13:53 13.9 34 18.52N 91 29.23W D .1 5 1.5 .1 5 257 5 0 C 92 3.1 1.1 0 438 780923 158 2t15.4 34 18.57N 81 l'.J5W 0 .1 5 1.4 .2 3 178 .8 0 C 73 4.5 2.1 0 439 780923 158 8835.9 34 19.50N 81 16.66W 0 .3 6 1.3 .1 2 137 3.8 7.2 C 95 23.0 3.9 30.9 440 780923 1684J143.1 34 19.55N 81 16.79W L .2 6 1.1 .1 2 136 3.6 6.7 C 94 22.1 3.5 29.6 441 780923 16 59839.7 34 18.58N 81 17.38W 0 .2 6 1.6 4 3 190 31.7 34.2 0 92 195.4 1.1 99.9 442 780923 18 37524.1 33 59.88N 31 11.19W D .0 6 2.5 t.8 22 349 1.0 0 C 81 n.2 1.2 0 443 780923 18:49t 2.4 34 .29N $1 4.03W D .1 8 2.5 t.6 26 333 .6 0 C 60 1.8 1.1 0 444 780923 20:28811.0 34 18.76N 81 10.76W 0 .1 6

1. 2 -). 3 4 144

.4 .6 A 54 1.9 1.7 2.9 445 780923 228 8: 5.4 34 18.67N 91 10.76W 0 .2 7 1.4 .3 4 146 .6 1.1 9 P1 ?.2 1.7 3.4 446 786923 22t138 1.0 34 24.01N 81 29.2PW 0 .0 8 1.5 .3 4 133 .1 .2 0 2 3 .2 5 447 780923 22:17:36.1 34 18.49N 81 20.07W 0 .1 5 1.2 -0.3 4 256 .6 0 C 92 3.3 1.2 0 448 780923 2282G837.9 34 2G.J3N 81 20.15 W 3.1 .0 7

1. 2 -;. 3 4 132

.1 .1 9 174 .2 .2 .5 449 780923 22821 39.3 34 18.28N 81 14.59W .3 .1 R

1. 7

.3 4 149 .2 8 9 ?3 .6 .6 2.3 450 780923 22:24124.7 34 18.30N 81 19.64W .1 .0 6 1.3 -).1 4 148 .1 .2 R 60 .5 .4 9 451 780923 22:551 5.0 34 23.35N Si 19.29W 3.5 .0 7 17 .7 6 168 .2 .6 R 141 7 .4 1.9 452 780924 G 29837.0 34 18.11N 81 10.71W D .0 5 1.1 -3.4 4 142 .1 0 C 80 .6 .6 0 453 780924 0830140.1 34 18.31N 81 10.48W D .1 5 1.2 -].3 4 149 .6 0 C 91 2.7 2.5 0 454 780924 0 32825.8 34 18.2 9 N 91 10.24W 2.2 .J 6 1.4 .0 4 146 .2 .6 A 72 1.1 1.0 2.4 455 780924 1 15:51.5 34 18.55N 81 23.39W D .1 6 1.3 -3.1 5 152 .3 4 B '1 1.2 1.0 1.9 456 780924 3817819.1 34 18.50N 81 10.69W .2 .0 8 2.0 1.1 4 147 .1 .5 A 11 .3 .3 13 457 780924 3 39140.2 34 18.54N 81 14.79W 3.7 .0 6 1.3 -;.3 4 147 .0 .0 B 29 .1 .1 .2 458 780924 3:44 15.4 34 18.79N 81 14.61W 2.0 .1 8

2. 3 L.7 4 143

.2 .9 A 3 7 .6 2.6 459 780924 3:4/t 2.7 34 18.47N 81 10.66W 0 .1 6 1.1 -;.5 4 147 4 6 9 40 1.8 1.7 2.4 460 780924 4 18 57.J 34 18.66N 81 14.88W .0 .1 6 1.2 -i.2 4 147 .6 1.2 A 49 2.9 2.6 5.0 461 780924 5814151.3 34 18.65N 81 10.66W 1.0 .0 7 2.1 1.7 4 165 .2 .8 A 21 .6 5 2.4 462 780924 5:15:52.1 34 18.64N 81 19.86W 0 .1 6 1.4 -3. 0 4 147 .4 5 A 17 1.6 1.4 2.4 463 780924 5836 17.5 34 id.79N 81 19.68W 0 .1 6 1.0 -3. 4 4 144 .4 .5 0 22 1.6 1.5 2.2 464 780924 7812828.5 34 18.52N 81 20.00W 2.9 .0 8 2.2 1. 4 4 149 .2 .5 9 33 .5 .4 1.3 465 780924 8812 59.5 34 18.3 7 N 81 19.62W 3.1 .1 7 1.5 .6 3 141 .5 .9 8 92 1.8 1.3 2.8 466 780924 8815t48.8 34 18.39N 81 20.21W D .0 5 .9 -1.4 5 152 .2 0 C 180 .9 .8 0 467 780924 8833852.4 34 18.53N 81 20.?iW 1.1 .1 6 1.1 -3. 3 5 151 .2 1.5 B 44 .9 .9 6.4 468 780924 9 17 56.0 34 18.73N 81 2n.30W D .1 5 .9 -3.4 4 149 .6 0 C 178 2.9 2.4 0 469 780924 9835851.6 34 18.4 3 N 91 20. 33 W 1.7 .0 6 1.1 -).1 5 153 .2 .9 9 20 1.1 1.0 4.0 470 780924 10855841.5 34 19.84N 81 20.06W D .1 8 1.7 .6 4 134 .2 .4 0 3 .6 .5 1.1 PAGE 10 TR 79-4, APP 2 4

s 01 JIL 1978-30 SEPT 19P8 V.C. SUMMER NJ CLEAR ST ATION EPI 9 ENTER LIST 0.95 CONFTOENCC RFG EVNT DATE ORIGIN-TIME LATITUDE L O NG I T UDE DrPTH S9R NO AMAG 04AG DMN GAP ERH ERZ 0 AZT A X* A AYMI OEPTH CODE YRMODA HP HIN SEC DEG MIN DEG MIN KM SEC KM DEG KM KM DEG KM KM KP 471 780924 13:43 21.9 34 17.92N 81 19.98W 20 .2 8

2. 2 1.5 5 156

.6 2.2 C 27 1.6 1.4 6.2 472 780924 20:38859.1 34 18.45N 81 20.00W 0 .1 6

1. 3 -T. 2 4 150

.3 .5 B Si 1.5 1.3 2.2 473 780924 21:30353.6 34 19.79N B1 20. 32W 2.6 .0 8 2.1 L.3 4 136 .1 3 R 10 .3 .2 .7 474 780924 21:30:59.1 34 20.17N 81 20.47W 0 .0 5 2.0 1.1 4 132 .1 0 C 7 .5 .3 0 475 780924 21 33t38.6 34 19.52N 81 16.29W D .3 6 1.2 .2 2 142 2.9 5.9 C 94 17.8 T.6 25.6 476 780924 21:58 3.6 34 18.59N 81 20.08W 2.0 .1 e 1.6 .4 4 149 .3 1.2 9 7 .9 8 3.3 477 780924 22:10:28.9 34 19.88N 81 20. 36W 1.1 .1 6 1.0 -.4 4 135 .2 1.0 9 177 .7 7 4.4 478 780924 22:20:44.3 34 18.32N 31 2n.24W 2.5 .2 6

1. 3

. 3 5 153 .7 1.8 0 4B 3.4 3.0 7.4 479 780924 22:21813.0 34 20.01N 81 20.57W 1.2 .1 6 1.2 -3.2 4 134 .4 2.1 0 179

1. 8 1.6 9.2 480 780924 22:331 8.7 34 20.01N S1 20.18 W 4.0

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