ML19312C125
| ML19312C125 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 03/22/1977 |
| From: | Chiang J, Stevenson D, Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC |
| To: | |
| Shared Package | |
| ML19312C124 | List: |
| References | |
| NUDOCS 7912050895 | |
| Download: ML19312C125 (34) | |
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i s. . 4 - 1 . i 1 . i o i ) i 1 i I 1 ) l A Report on the i Seismic Activity at Lake Jocassee f Between June 1, 1976 and Febru ry 28, 1977 f i Pradeep Taiwani, Principal Investigator i and Don Stevenson, Jin Chiang, and Dave Amick Geology Department University of South Carolina Columbia, South Carolina 29208 4 t . Do % I 7912050 g 75 - S I r x , d ,' e --- n.- - -- -,- ., , , , .,--w ,,,.,---a e v-.,.,- , m - w,, . - , - - - r
1 I.l. INTRODUCTION In the first phase of seismic studies at Lake Jocassee a scismic network
, using four to seven stations was deployed from November 1975 to June 30,
'76. In the second phase the University of South Carolina maintained one station in the vicinity from July 1 - October 27, '76. In the third phase from October 28, '76 to present, we have reoccupied the area with a network of four to five stations. The results of the first phase were submitted to Duke Power Company by Law Engineering and Testing Co. The University of South Carolina's program at Lake Jocassee is geared toward earthquake pre-diction and is sponsored by the National Science Foundation and the United States Geological Survey. A preliminary report of our fin (ings from October 1975 to May 1976 was made to the U. S. G. S. in August, 1976. A copy of that report was provided to the Duke Power Company in October 1976.
In order to obtain a continuity in coverage, in this report ue present results of the data collected since June 1, 1976. The results are thus divided into three parts;
- 1. June 1976
- 2. July 1, '76 - October 27, '76
- 3. October 28, ' 76 - February 28, '77.
I.2. SEISMIC STATIONS DEPLOYMENT Sprengnether's portable seismographs MEQ 800 were used. The sites occupied (since October 1975) are listed in Appendix 1. In identifying the sites in later discussion and in tables, the location number (first
, column) is used.
I.3. DEFINING AN EVENT While cataloging, an' ' event' was counted if its duration was at least Y
. 2 ,
2 seconds (M = -1.2), or if it was recorded on at 1 cast two stations. Events were located by using a computer program HYP071 (Lee and Lahr,1972) and velocity model developed for the Clark Hill reservoir area (Appendix II). The location accuracy is about I 200m while the depths are usually
- good to f 400m.
II. RESULTS 11.1. jut lE 1976 In June 1976 seven locations were occupied by scismographs - though at any time only four to six instruments were used. A total of 122 events
. were recorded (Appendix III) of which 46 were located (Fig.1). Compared to earlier months the seismic activity spread further to the northwest and south and southwest. There were 6 events withgM ]>1, including felt events on June 2,11 and 12. Another feature of the activity was generally deeper hypocenters, six events with depths greater than 3 km were recorded.
One event (M = 1.6) recorded on June 22 at 06.36 (UCT) occurred far to the south of Lake Jocassee and is not shown on Fig.' 1. Its epicenter 1 l was located within about 5 km from Keowce Dam. We could not ascertain if t j j any blasting operations were underway at that time at that location. ! 11.2. JULY 1,1976 - OCTOBER 27, 1976 In this time period we maintained only one scismoeraph at SMT. This- + location was used as it was sciccted as the site for the permanent station that is planned to be inst'alled. Data were not obtained for nine days
- due to malfunction of instruments,and other ,1.ogistical problems. Of the i.
100 events recorded _ (an average of 'almost one per day), 88 appear to have occurred in the vicinity'of Lake Jocassee (S-P fl sec). .(See also Table 1). Only three local events with Mg )fl.0 were recorded.
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6 TABLE 1. DETAILS OF EVENTS RECORDED AT SMT BETWEEN JULY 01, 1976 AND OCTOBER 27, 1976. S-P (acc) No. of Events 13 T f P. 25 0.25 ( T 4 0.50 57 0.50 ( T f 0.75 8 0.75 ( T f 1.0 10 ,. Gi 1.0 ( T f l.5 17 1.5 ( T $ 2.0 ~ 4 2.0 ( T ( 2.5 1 2.5 4 T ( 3.0 1 3.0 4. T 15 (Blasts?) Using the 88 local events, a b-value of 1.59 was obtained (Figure 2). (See also Appendix VI). II.3. OCTOBER 28, 197? - FEBRUARY 28, 1977 In this time period seismic stations were maintained at BG3, KTS, ODL and MCS. Towards the end of February '77, BL2 was also occupied. Between October 28,_'76 and February 2, '77, 107 events were recorded . (Appendix VII) of which 38 were located (Appendix VIII) and are shown in ; Figure 3. The activity lies in a broad NW-SE band about 4 km south of the , lake. A b-value of .94 was obtained (Fig. 4). In this period there vere 13 events with Mg pl.0, the largest onej felt, occurred on January 30, _
'77 (M,=
g 1.6). Its location could not be obtained. This period was also characterized by a complete absence of seismicity betucen December 28, 1976 and January 14, 1977. Between February 4 and February 28, '77, 97 events
-were recorded and 42 were located. The most important event was a magnitude'
. 1
U 7 JOCASSEE EARTHOUAKES FROM OCT. 28,76 TO FEB. 2.77 33 . .
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8 - 2.25 cvent on February 23, '77 (08:50 UCT). This was preceded by two weeks of foreshock activity (Sce Figure 5 and Appendix VIII).
.- III. DISCUSSION Since June '76, lou level scismic activity has continued (about one event a day). In June '76 the activity seemed to be spreading, and one event was located near Lake Kcowce. There was a complete absence of activity in the first half of January 1977. The largest event in the reporting period occurred on February 23, 1977 (M g = 2.25) and it was followed by 32 aftershocks in the next 24 hours.
IV. REFERENCES Gutenberg, B. and Richter, C. F. (1956). Magnitude and energy of earth-quakes , Ann. Geol. 9, p 1-15. l i Lee, W. H. K. and Lahr, J. C. (1972). A computer program for determining hypocenter, magnitude. and first motion pattern of local carthquakes. Revisions of HYP071, USGS Open File report, 100pp. Taiwani, P. (1975). Crusial Structure of South Carolina, Second Techni-cal Report, Contract No. 14-08-0001-14553, U. S. Geological Survey.
'alwani, P. , D. Stevenson, J. Chiang, D. Amick (1976) . The Jocassee Farthquakes - A Prcliminary Report. Third Technical Report, Con-tract No. 14-08-0001-14553, U. S. Geological Survey.
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12 - APPENDIX I STATION LOCATIONS No. Stn. Lat. Long. 1 1 BL2 3457.92N 8257.24W 2 KTS 3456.00N 825'.084 3 BG3 3459.58N C255.904 i 1 4 ODL 3455.82N 8257.26W 5 SD1 3457.25N 8255.85W 6 BCS ~ 3455.90N 8257.86W 7 FMS 3456.43N 8257.56W 8 JI2 3500.59N 8254.31W 9 RRS 3454'.28N 8257.08W' 10 NSF 3500.14N 8754.37W 11 GCS 3456.50N 8254.91U 12 TFS 3459.69N 8252.96W 13 BGS 3459.32N 8256.19W 14 JIS 3501.73N 8254.63W 15 WWF 3459.13N 8256.78W l 16 LQ2 3458.11N 8254.82W 17 BG2 3459.45N 8255.88W 18 VPS 3457.13N 8300.07W 19 LAU 3501.18N 8301.30W 20 SMT 3455.85N- 8258.26W 21 FTC 3500.84N 8301.29W 4 22 MCS 3457.12N 8300.45W m.= + wr ->. *
- 13 4
. APPENDIX II 1, VELOCITY MODEL i
l HYP071 was used to locate various events. The crustal model used is i i Velocity Depth km/sec km 5.75 0 l 6.2 0.5 1 8.1 30.0 This model was developed for the Clark Hill reservoir - also located on gneissic rocks in the South Carolina Piedmont (Talwani, 1975). e
* +
n P *P
14 APPENDIX III LIST OF EVENTS IN JUNE 1976 In column 3 the " station of max. duration" refers to the location of a station where the recorded duration event was maximum. The station number corresponds to that listed in Appendix I. The maximum recorded duration for any event is given in column 4. In column ; are listed the total number of stations recording the event. The daily energy release is listed in column 6. The daily energy is calculated using a simplified magnitude - energy relation (Gutenberg and Richter, 1956), i.e., log 10 E = 11.8 + 1.5 M g where 1( = calculated duration magnitude. For Jocassee (Taiwani and others, 1976) M g= -1.83 + 2.04 log D bhere D = duration of event in seconds. Events with magnitude )1 are listed in column 7. l
. -i e
.. . . - , . ....g,,. l
. 15 DATE TIME STN OF DURATION MO OF STN ENERGY Mg >j l. 0 ll:M:S MAX (SEC) REC EVENT PER DAY DURATION (ERGS)
. 760601 03:52:33 22 3 4 07:21:14 ~
22 2 1 11:23:04 22 30 4 3.7 x 10 13 1.32
. 760602 00:18:41 2 2 1 02:19:17 22 4 3 06:22:33 22 5 3 09:54:40 22 20 3 09:55:40 22 5 3 10:25:43 22 4 2.
.. 11:43:05 3 2 1 17:38:06 17:39:19 4 _ 18 3 18:16:16 20 71 4 1.95
. 18:21:01 22 5 1 18:29:35 22 5 1 20:00:25 22 3 1 20:17:21 22 7 1 20:25:14 22 4 1 20:51:55 22 10 4 21:13:29 22 3 1 21:13:1? 22 4 1 21:57:56 22 8 1 6.4 x 1614 760603 03:22:02 22 2 1 04:17:13 22 4 3 06:15:20 22 4 3 09:45:46 22 5 3 11 i 11:46:58 22 3 1 3.1 x 10 760604 00:53:21 22 2 4 10 04:20:53 22 2 1 1.8 x 10 760605 04:54:12 22 2 3 14:14:56 2 4 2 14:34:28 2 3 2 11 14:45:26 2 3 4 1.5 x 10 760606 12:47:19 22 4 1 16:07:14 3 2 1 11-16:56:13 22 6 5 3.1 x 10 760607 04:29:04 22 4 1 17:04:53 3 4 3 11 22:16:35 22 4 4 2.4 x 10 760608 07:00:48 22 2 3 07:34:15 22 2 4 10 19:26:43 3 2 l' 2.9 x 10 e y i$g w- - 9 * * -""hhgg w
16 DATE TIME STN OF DURATION NO OF STN ENERGY g ) 1.0 " H:H:S FUDC (SEC) REC EVENT PER DAY DURATION (ERCS) 760609 02:28:50 22 2 3
' 03:49:32 22 7 5 04:56:36 3 5 4 10:34:05 3 3 3 11 ,. 16:12:18 22 2 2 6.2 x 10 760611 03:25:21 3 2 3 10:07:06 22 10 4 17:00:10 1 93 5 15 1.2 x 10 2,._19 760612 04:21:51 2 56 5 1.74 04:35:41 22 7 5 06:00:39 3 5 4 06:21:00 22 -
7 3
. 11:12:44 1 4 2 12:03:40 22 6 4 12:25:26 2 4 2 12:26:24 1 2 1 12:26:30 1 2 1 12:26:40 1 10 3 13:20:10 1 2 1
, 15:12:56 22 7 1 15:57:42 22 2 1 18:25:52 22 3 4 18:58:00 1 2 14
, 1 2.5 x 10 760613 00:04:27 22 3 2 1
03:41:11 1 3 2
- , 04
- 25:54 22 5 3 07:42:23 22 2 1 13:57:38 22 3 1 23:18:00 22 2 1 23:40:55 22 35 4 13 6.0 x 10 1.32 1 760614 04:42:07 3 2 1 08:37:35 22 3 4 22:12:24 3 2 1 10 22:13:35 22 3 3 7.6 x 10 760615 05:15:01 22 3 3 06:28:28 22 3 1 12:49:30 1 2 1 13:25:27 1 3 2 21:41:44- 22 4 3 2.3 x 10 11 760616 13:16:03 3 3 3 14:03:46 3 2 2 l 14:46:11 3 2 1 22:30:29 22 7 5 23:52:00 l' 2 1 4.9 x 1011
- mem. .py e
17 DATE T DIE STN OF DURATION NO OF Sni ENERGY ' H:M:S MAX REC EVENT PER DAY ML )7 1.0 (SEC) DURATION (ERGS) 760617 02:00:21 1 3 1
. 04:10:02 3 4 1 11:06:18 3 4 1 12 19:34:04 1 6 5 1.0 x 10 760618 07:00:11 1 7 5 07:01:32 1 2 1 07:20:11 1 3 1 12:29:39 1 8 5 13:27:20 22 9 5 13:30:05 3 4 3 18:55:38 1 3 3 22:27:24 22 9 5 12 3.1 x 10
.,, 760619 00:59:22 1 5 5
, 01:09:21 1 5 5 . 01:51:00 1 13 5 02:05:04 1 3 4 03:47:23 1 6 4 2 03:49:07 1 8 5 , 10:21:28 1 4 5 19:15:32 22 2 1 12 21:06:49 20 2 1 4.3 x 10 10 760620 23:49:02 3 3 3 3.3 x 10 760622 06:36:29 1 50 5 1.8 x 10 1.64 760623 11:25:13 1 2 14 2 9.5 x 10 760624 14:15:26 1 2 9 4 9.5 x 10 760625 00:37:44 1 2 1 05:47:16 1 3 3 10 4.2 x 10 760626 01:38:04 1 2 1 04:16:07 1 17 5 06:59:00 22 3 5 10:32:01 1 2 1 6.6 x 1012 760627 01:10:14 22 4 2 12:20:57 1 2 2 10 4.22 x 10 760628 11:00:00 1 2 1 12:28:59 1 2 1 17:19:15 1 2 2 18:05:59 3 3 2 1.9 x 10 10 l
18
~
i i 1 i f APPENDIX IV I
,. LOCATION OF EVENTS IN JUNE 1976 t
i
) Computer printout of IlYP071 showing data for location of events.
l Column 1 Date. Column 2 Origin time (UCT) h.m.sec. ' Column 3 Latitude (N) degroes, min. ( Column 4 Longitude (W) degrecs, min. Column 5 Depth (km).
. Column 6 Local duratioa magnitude.
Column ? Me, of etetien resdinge uced te lacate event. P and S arrivals from same stations ar6 regarded as 2 readings. 1 Column 8 Largest azimuthal separation in degrees between stations. Column 9 Epicentral distance in km to nearest station. ' Column 10 Root mean square error of time residuals in sec. RMS = k0,whereR is the time residual ior the ith station. Column 11 Standard error of the epicenter in km . i i i- Column 12 Standard error of the focal depth in km . l
- Statistical interpretation of standard errors involves assumptions which may not-be met in earthquake locations. Therefore standard errors j may nct represent actual error limits.
l If ERll or ERZ is blank, this:means that it cannot be computed, because of insufficient data. I i i' i f
' 19 JOCAssEE EARTHOUAKES FROM JUNE 1 e 76 TO JUNE 10 e 76 DATE ORIGIN 1.AT N LONG W OEP7H MAG NO Gr.P DHIN RMS CRH ERZ 0" 7606nt 352 32.09 34-54.45 n?-56.49 0.75 .86 6 251 2.9 0.04 0.7 4.0 C1
. 760601 1123 3.94 34-56.64 87-59.41 1.57 1.18 6 330 ?.? 0.02 1.6 1.5 C1 760607 622 32.03 34-5R.54 RP-58.14 0.50 .40 4 23a 3.9 0.00 C1 760602 954 40.45 34-54.35 4?-57.75 1.95 82 6 222 3.6 0.05 0.5 1.2 C1 760602 1025 42.F4 34-94.71 87-57.46 0.53 .60 4 ??1 2.9 0.02 C1 76060? 1R16 15.94 34-56.A0 6P-59.16 0.86 2.00 6 317 2.? 0.05 3.0 8.2 01 760602 2051 59.79 34-57.00 AP-59.34 0.42 .21 8 265 2.7 0.03 0.4 0.8 C1 7A0601 945 45.43 34-45.n7 87-55.66 ~3.75 .40 4 271 2.4 0.01 C1 760606 1247 18.33 34-59.26 87-56.00 2.27 .86 6 1A3 0.6 0.03 1.2 0.4 C) 760606 1656 11.H5 34-57.8R H2-59.46 1.25 .24 a 236 3.A 0.03 0.2 0.8 C1 760607 17 4 51 07 35- 0.00 H2-55.24 1 00 .60 3 311 1.7 0.01 C1 760607 P216 31.81 34-59.68 87-54.6R 3.61 .60 8 P56 1.9 0.19 1.8 1.8 C1 760608 7 0 46.34 34-58.35 82-56.39 ?.99 .99 4 220 1.5 0.nl C1 760609 734 13.61 34-59.74 82-57.30 3.05 .99 6 219 1.5 0.n2 1.1 0.3 C1 760600 349 3n.77 34-58.52 82-55.59 1.75 .11 8 154 2.0 0.02 0.1 0.3 B1 760600 456 34.tP 34-57.?9 8?-56.54 0.77 .40 8 110 1.5 0.04 0.2 1.0 31 760611 325 26.29 34-58.41 97.-55.11 0.47 - .99 4 243 2.5 0.01 C1 760611 10 7 5.12 34-56.54 82-59.83 0.16 .21 6 289 P.7 0.05 0.4 0.9 C1 760611 17 0 8.43 34-57.16 82-59.07 1 96 2.14 4 254 P.7 0.00 C1 760612 421 50.84 34-96.93 8P-59.13 0.30 1.74 6 259 2.4 0.04 0.7 0.2 C1 760617 6 0 32.36 34-57.0A 82-55.57 1.88 .40 6 I?4 4.3 0 13 0.8 4.3 al 76061P 621 0.14 34-59.5A 87-55.54 1.70 .11 6 158 1.9 0.00 0.0 0.1 R1 7A0612 12 3 34.77 34-47.89 87-57.34 1.67 . P.4 6 277 0.7 0.02 0.2 0.2 c1 I 760617 1825 51.21 34-58.97 82-55.39 2.61 .99 6 179 1.4 0.02 0.2 0.4 01 7A0613 2340 53.91 34-98.37 BP-55.63 0.62 1.32 6 149 P . 3 0. 0P. 02 2.0 C1 To06ie 637 3T.<2 a4-,9.16 b?-55.64 5.17 .66 6 172 0.9 0.09 1.1 1.P C1 7(0611 2P13 33.5f.'34-57.19 G7-54.iG 1.92 .ub 4 343 3.1 U.00 C1 760616 ??30 29.11 34-58.81 8?-98.29 1 59 .11 8 749 P.3 0.02 0.2 0.3 C1 7A0617 1934 P.56 34-5R.59 4P-%5.79 2.06 .24 6 145 1.8 0.01 0.1 0.1 81 760610 7 0 10.30 34-57.06 87-55.865 P.12 .11 6 144 2.1 0.01 01 0 2 51 760618 1229 39.14 34-99.53 H2-57.84 2.00 .01 6 263 3.0 0.01 01 0 1 C1 76061A 13P7 19.P4 34-59.56 82-58.04 1 00 .12 6 267 3.3 0.02 0.3 0.6 C1 76a61R 2227 23.63 34-59.45 87-57.76 1.70 .12 6 259 2.P G.n3 0.4 0.7 C1 760619 1 9 20,83 34-59.66 82-58.20 0.10 .40 8 272 3.5 0.04 0.3 0.4 C1 760619 150 59.54 34-59.68 82-57.37 1.77 44 8 264 2.? 0.07 0.7 0.B C1 760619 347 22.35 34-59.56 97-57.97 1 04 .24 6 290 3.2 0.01 0.1 0.3 C1 760627 636 26.76 34-49.P- 87-55.93 3.83 1.64 8 321 11.7 0.02 0.3 0.7 C1 760A24 1415 2A.04 34-59.04 8?-55.99 1 62 .99 6 254 P.7 0.02 12 1.7 C1 760679 547 15.00 36-s6.47 92-57.08 3.22 .86 4 332 1.8 0.01 C1 760APS 416 7.49 34-56.01 87-56.20 2.96 .68 a 174 3.1 0.07 0.4 0.8 B1 7606P6 658 59.96 34-56.04 82-56.94 2.55 .46 8 173 3.5 0.07 0.4 1.0 81 760627 110 13 37 34-55.97 82-57.09 2.78 .60 4 267 1.R 0.00 C1 760627 1220 56.61 34-57.97 07-55.86 2.91 .99 6 223 2.1 0.02 0.2 0.3 C1 e
m e i
~e..
-- .- .- .__=. - . ~ .. . . - . .. - - - .
i- 20 i 1 3 j - i j APPENDIX V I. LIST OF EVENTS FRCM JULY 01, 1976 TO OCTOBER 27, 1976 l'.
! The list of events recorded at SMT is given on the following pages.
i 1 j In column 2 are listed the total number of events per day (on UCT). The
; daily energy release is listed in column 3. Events with M g >fl .0 are listed i '
in .colur.a 4 and their occurrence time (h.m.sec.) is given in column 5. j The events with Mg >f 1.0 and marked with an asterish (*) are those.with ) S-P times >fl sec, and probably not local. Ilowever, they have been incor-i j porated in energy calculations. i 1 } i 4 I i b, d 4 1 . 1 f o 4
, - , - , sa, -- -n-, ,n .m e . -,--<n .
w, ,- . , r- n - - , - - , , . ' p. s -
21 DATE NO. OF EVENTS ENERGY / DAY M > 1.0 TIME 070176 3 1.4 x 10 13 070276 3 3.8 x 10 11 9 070376 1 9.5 x 10
- 11 070476 1 4.4 x 10 070576 1 1.8 x 10 14 *1.64 23:02:08 070776 1 9.5 x 10 l 070876 1 9.5 x 10 9 11 070976 2 1.8 x 10 071076 1 9.5 x 10' 071176 5 3.8 x 10 *1.18 01:17:15 071276 2 2.8 x 10 11 12:24:51 13 071376 1 3.8 x 10 1.18 I 071476 2 4.5 x 10 14 *1.65 04:
*1.74 12:15:00 1
071776 2 2.4 x 10 *1.06 01:49:00 071876 1 9.5 x 10' c 071976 1 7.8 x 10 10 072076 1 2.1 x 10 *1.06 23:51:00
~
072176 1 7.9 x 10 13 072276 1 3.8 x 10 *1.32 15:00:00 l 12 072376 2 y 1.5 x 10 1 11 080176 2 1.1 x 10 1.1 x 10 11 080276 2 l . 080376 1 4.4 x 10 11 080476 3 1.7 x 10 11 080576 2. , 8.9 x 10 10 l 1- - 1- - . . . - .- . . . _ . . ._ , ,
22 - DATE NO. OF EVENTS ENERGY / DAY g >f 1. 0 TDE O80876 1 3. 3 x -1010 , 3.3 x 10 10 081076 1 081276 1 2.7 x 10 11
. 10 081376 1 7.9 x 10 081476 1 9.5 x 10 081576 10 1 7.9 x 10 081676 1 3.3 x 10 081776 2 -1.8 x 10 081876 4 1.3 x 10 082576 1 3.3 x 10 10 082676 2 2.8 x 10 082876 1 3.3 x 10 10 083076 1 7.9 x 10 083176 1 23 9.5 x 10 9 1
3.3 x 10 10 090376 1 l l 090476 --090776 NO DATA 090976 2 1.9 x 10 091476 2 7.9 x 10 13 1.37 01:20:22 3 091676 2 9.1 x 10 *1.44 19:55:00 091776 1 1.6 x 10 10
~
091976 3.3 x 10 1 092076 1 2.7 x 10 092176 -1 2.7 x 10 092276 4 5.8 x 10 092376 3 9.9 x 10 10 2.'7 x 10 11 092576' 1 ,
, - - - - . - , .m. -
/ 23 , e DATE 1:0. OF CVENTS ENERGY / DAY g >f 1. 0 Tn!E 092876 1 [E'y 1.3 x 10 12 100476 1 4.4 x 10 11 101076 10 1 - 7.9 x 10 101276 8 1.6 x 10 101376 13 3 2.2 x 10 1.00 09:27:28 101576 1 6.6 x 10 101676 -- 101876 NO DATA 101976 1 _1.6 x 10 - 102076 1 3.3 x 10 10 102176 1 3.3 x 10 102276 -- 102376 NO DATA 1 102476 1 4.4 x 10
/8 mm e mee , * * -
i . 24 - l* APPENDIX VI
~
A NOTE ON Tile METIIOD USED TO OBTAIN Ti1E b-VALUE The magnitudo-recurrence relationship log N = a + bM g is used to define the 'b-value.' N=cumulativenumberobeventswithmagnitude>M. Instead of M g l we used log D. (D = duration of event in seconds) to which it is related. The following duration intervals were used: 0-2, 3-4, 5-6, 7-8, 9-10, 10-15, 16-20, 21-25, 26-35, 36-45, 46-55, 56-75, etc.; the data uere plotted in ene middle of the interval chosen. Tv - o*u tain the b- .
- ue, a least squarc linear regression equation was used.
Y = a + bx where
]~xy -IvEy n
b= Ex 2 . ( Ix)9 n a = 7_ y - bEx n where n = number of pairs of x and'y values. In our case x = log Duration y = log (Cumulative number of events) n = number _ of data points being used, the first and last being neglected.
25 W APPENDIX VII LIST OF EVENTS BETWEEN OCTOBER 28, 1976 AND FEBRUARY 28, 1977 ! The data presented follow the format of Appendix IkI. DATE TIME STN OF DURATION NO OF STN ENERGY Mg ),1.0 H:M:S MAX (SEC) REC EVENT PER DAY ' DURATIOM - (ERGS) 102876 20:16:40 2 3 4 3.3 x 10 102976 03:36:11 22 3 4 06:35:28 22 10 3 16:22:40 3 3 1 9.6 x 10 11 110176 08:13:57 2 9 3 14:00:03 3 2 1 3I 9.4 x 10 110376 03':08:43 22 8 4 I 03:14:23 22 4 4 12 03:17:16 22 8 4 9.4 x 10 10 110476 07:53:35 4 2 1 3.3 x 10 110776 07:53:35 4 2 1 23:00:00 3 3 1 4.5 x 10 10
~
110876 23:06:22 3 24 4 1.0 13 23:06:42 4 6 4 2.0 x 10 110976 02:57:46 3 10 4 04:42:52 4 3 4 06:18:19 4 2 2 06:53:13 4 3 3 1.4 x 10 12 111076 00:32:16 3 3 l' 14:43:26 22 3 1 6.6 x 10 10 111176 12:54:48 3 3 1 14:39:14 3 3 1 10 15:29:18 4 2 1 7.6 x 10 111276 12:16:04 -4 2 1 9.5 x 10 9
~
26 _ DATE TDtE STN OF DURATION NO. OF STN ENERGY Mg g 1.0 H:M:S MAX (SEC) REC EVENT PE't DAY DURATION (ERGS) i 111376 01:00:34 22 5 3 i . 01:03:00 2 10 4 11:34:40 22 10 3 1 , 13:18:06 2 4 1 15:09:00
< 4 4 1
- 15
- 18:07 22 7 4 15:18:59 4 2 1 15:19:25 4 2 1
, 15:19:36 4 2 1 i
15:24:59 2 25 4 1.0 15:28:01 3 2 2 13 15:42:42 2 15 4 3.0 x 10 111576 14:43:35 22 9 4 12 22:16:25 2 4 4 1.0 x 10 111776 06:49:39 3 2 1 11 18:16:06 3 5 2 1.6 x 10 111876 05:34:02 2 3 3 l 05:35:04 4 2 2 l 06:03:07 4 2 1 13:23:31 4 1 1 10 q 22:16:55 3 3 2 5.0 x 10 111976 04:22:19 22 2 1 23:18:41 22 4 2 7.9 x 10 10 112476 18:23:39 2 5 3 1.6 x 10 11 112576 02:34:38 4 3 2 3.3 x 10 1 112776 06:49:06 3 3 3 1.3 x 10 12 ! 112876 02:15:11 2 50 3 14 1.64 ! 22:34:46 2 30 4 2.2 x 10 1.18 10 113076 16:51:15 2 4 3 8.8 x 10 I ' l 120276 10:02:12 22 7 4 4.4 x 10
, 120376 15:55:29 22 6 3 2.7 x 1011 120476 14:21:42 3 35 4 6.0 x 10 13 1.32 120576- 01:13:25 2 40 4 1.44 03:53:24 2 4 4 9.1 x 1013 120676 04:31j40 22 7 3 4.4 x 10 11 1
,,w -
e v mo, .= ie.--. 4 , w-- ,,+ , - , 4- , e g e
27 _ DATE T11tE STN OF DURATION NO OF STM ENERGY 1( ) 1.0 ll:M:S 1%X (SEC) REC EVENT PER DAY DURATION (ERGS) 120776 02:09:40 22 23 1 13 17:12:15 4 5 2 1.7 x 10 10 120976 23:06:08 22 3 1 3.3 x 10 10 121176 21:55:28 22 3 1 3.3 x 10 121376 20:24:26 '3 4 4 10 21:06:29 4 2 1 8.8 x 10 121676 06:50:29 4 3 1 07:48:10 3 48 3 1.60 09:38:00 3 30 3 2.0 x 10 14 1,13 1 121776 00:52:55 2 33 4 5.0 x 10 1.27 121876 06:28:03 4 5 3 10 06:22:22 3 2 4 2.5 x 10 121976 03:52:48 3 4 3 7.9 x 10 1220/6 1/:42:09 22 4 1 7.3 x 10 11 122476 02:21:00 22 3 3 1.1 x 10 122876 03:21:15 3 3 3 05:35:15 22 5 4 09:02:32 2 3 4 11 09:40:14 22 7 4 1.2 x 10 123176 17:50:37 3 8 1 6.6 x 10 10 010177 - 011377 HO EVENTS 011477 00:20:56 22 35 4 1.32 00:26:24 4 50 4 1.64 04:17:52 22 3 1 10 05:47:49 22 3 1 2.1 x 10 11 011577 03:45:52 22 7 4 4.4 x 10 011777 05:34:20 2 8 4 22:22:59 22 37 4 1.37 13 22:51:57 22 1 1 7.8 x 10 011877 00:12:12 22 2 2 01:27:42 22 2 1 03:16:03 22 4 2 03:18:30 22' 3 1 4.1 x 1011
La 28
~
STN OF DURATION Na OF STN ENERGY DATE TU1E MAX (SEC) REC EVENT PER DAY Mg 'y 1.0 HrM:S D!fRATION (ERGS) 01217 01:03:05 22 3 1 12:41:40 22 6 4 10
.' 17:24:05 3 3 1 7.0 x 10 012277 00:53:21 3 2 1 ' .' 00:55:09 3 2 1 07:42:53 2 3 1
- 14
- 38:24 22 2 1 6.1 x 10 10 012377 00:54:45 22 4 4 7.9 x 10 10 10 012477 11:07:55 22 3 1 3.3 x 10 012577 13:34:57 4 4 1 10 13:39:30 4 _ 4 1 1.6 x 10 9
012877 18:22:11 2 2 1 9.5 x 10 14
- 013077 23
- 30:58 2 48 1 1.6 x 10 9 1.60 020177 11:57:35 4 2 2 9.5 x 10 020277 17:25:21 22 37 4 1.37 13 23: 56:27 ?.2 13 4 7.4 x 10 020377 03:04:06 4 2 1 07:41:45 22 2 2 07:48:49 22 2 2 07:49:03 22 3 2 07:52:39 22 3 2 10 09:04:37 22 2 2 7.1 x 10 020477 23:48:50 3 5 3 1.6 x 10 11 .
4 020577 02:04:54 22 9 4 11 05:10:30 NOT LOCAL 6.6 x 10 14 020677 21:54:12 2 70 4 5.0 x 10 1.93 020977 03:12:35 2 4 4 12 05:10:30 2 15 4 4.6 x 10 021077 00:44:19 2 2 4
- 01:07:14 22 7 4-
' 11 22:45:00 22 3 3 5.6 x 10 021377 13:31:24 2 6 4 12 14:36:30 2 10 3 5.8 x 10 I
L.
29 DATE TI!!C STN OF DURATION NO OF STN ENERGY ML )1.0 H:H:S MAX (SEC) REC EVENT PER DAY DURATION (ERCS) 021477 06:21:07 2 20 4 1.1 x 10 13 021777 22:07:08 22 30 4 3.8 x 10 13 1.32 + 021877 06:11:05 22 4 4 06:11:50 22 5 4 08:52:37 22 35 4 1.32 09:39:03 22 5 4 10:07:15 22 3 1 6.1 x 10 13 23:09:11 3 2' 1 10 021977 11:22:20 3 3 1 7.9 x 10 022077 03:46:15 4 5 3 11 09:37:49 3.2 x 10 4 _ 5 3
'.. 022177 17:43:42 2 35 3 1.32 ; 19:12:36 2 3 2 l 20:38:11 22 4 3 20:53:22 3 22 3 20:53:49 4 3 3
. 21:11:23 2 10 3 { 22:08:40 2 3 3 22:08:50 22 3 3 7.7 x 10 13 022277 02:53:42 2 3 4 05:32:33 2 8 4 08:42:20 22 3 4 09:07:24 22 3 4 7.5 x 10 11 2 022377 07:08:50 2 12 5 j 07:26:23 22 4 5 03:50:08 22 100 5 2.25 08:50:31 ? 08:50:39 ? 08:51:05 1 3 4 i 08:55:05 1 3 5 08:58:41 1 3 2 l 09:04:33 2 12 4 09:11:25 1 2 4 09:12:08 1 3 5 l 09:14:14 1 3 1 ! 09:34:47 1 3 3
, 09:51:54 1 3 2 l 11:08:53 1 2 l' L 12:58:45 1 3 1
(- 13:01:23 NOT LOCAL 14:29:10 1 2 1 14:58:20 1 5 2 15:04:42 1 6 5 l 4
w . e .* 30 DATE TI!!E STN OF DURATION NO OF STN ENERGY M 1.0 11:M:S MAX (SEC) REC EVENT PER DAY b )f DURATION (ERGS)
, 022377 15:10:47 1 2 1 (cont.) 15:53:32 1 3 1
- 15
- 53:53 1 2 1
,. 19:11:33 4 3 4 19:37:46 3 5 4 19:38:06 1 4 4 19:35:04 1 2 4 19:42:14 2 4 4 20:42:50 2 4 4
, 22:17:06 22 3 3 22:17:12 22 3 3 15 23:35:10 22 3 1 1.6 x 10 022477 00:19:27 1 2 2 00:23:45 1 6 4 00:23:53 1 6 4 02:14:56 1 2 2 03:56:06 22 37 5 1.44 03:56:20 ?
06:33:56 1 25 4 1.00 13
- . 17
- 39:21 3 2 1 9.2 x 10 022577 02:59:44 22 3 2 03:13:08 1 3 4 03:18:18 1 2 1 03:25:59 1 3 3 04:26:39 1 2 1 09:13:28 1 2 2 12:26:19 2 4 4 4
13:21:22 22 2 1 16:31:43 3 5 1 17:12:40 3 11 3 12 19:12:03 1 7 4 2.4 x 10 022677 01:35:01 3 3 3 06:15:05 3 2 3 10 12:36:49 3 3 1 7.4 x 10 022777 05:07:55 4 5 5 06:10:43 2 8 5 11 20:13:35 1 3 3 8.5 x 10 2 022877 00:49:47 1 3 4 06:30:55 1 6 4 07:40:39 1 5 - 09:00:05 1 2 ? 18:10:07 1 2 1 2 23:15:17 3, 9 4 1.7 x 10 , l s epwe , . . .
31
, APPENDIX VIII
, LOCATION OF EVENTS BETWEEN OCTOBER 28, 1976 AND FEBRUARY 28, 1977 The location list is llYP071 printout and follows the format of Appendix IV. 9 9 e 4 I e I
, , 32 JOCASSEE EAnnIQUAKES FROM.0CTOLER 28, '76 TO FEBRUARY 28, '77 _
DATE ORIGIN LAT N LONG W DEPTH MAG No GAP DMIN RMS ERH ER7. OM 7610pn 2016 39.79 34-97.77 87-56.65 0.89 .86 6 223 4.3 0.05 0.5 4.4 C1 761029 635 27.82 34-58.35 87-55.54 1.03 .21 8 153 P.3 0.09 -0.6 3.1 C1
. 761101 813 56.92 34-66.36 82-56.44 0.65 .12 6 182 4.3 0.03 0.1 2.2 Cl 761103 3 8 f.3.P0 34-56.70 07-99.54 1.39 .01 8 184 1.6 0.06 0.4 0.9 C1 761103 315 22.67 34-G7.06 82-59.3n 0.74 .60 8 148 1.6 0.04 0.3 1.6 R1 761103 315 1c.97 34-;7.01 82-58.96 0.65 .01 8 144 7.3 0.04 0.3 2.9 C1 761104 23 6 20.92 34-55.92 82-57.74 P.56 1.00 7 105 0.7 0.07 0.5 1.1 R1 761109 25) 44.35 34-56.06 82-56.83 2.76 .21 8 145 0.3 0.02 0.1 0.2 R1 761109 442 50.58 34-56.40 82-58.P1 'l.66 .86 6 251 P.5 0.02 0.3 0.5 C1 761111 1 0 32.21 35- 1.58 82-54.05 0.58 .40 6 295 4.9 0.25 0.2 5.9 01 761111 1 2 59.73 34-55.44 8?-55.76 P.39 .21 6 2A9 P.4 0.01 0.1 0.1 C1 761113 1134 39.P4 34-56.01 87-50.56 1.14 .21 6 231 2.5 0.03 0.3 0.8 C1 761113 1524 58.17 34-G5.5A 82-55.41 0.09 1.00 8 207 2.8 0.02 0.2 0.3 Cl 761113 1542 41.18 34-55.63 82-55.41 0.31 .57 8 198 ?.A 0.02 0.1 0.P Cl 761115 1443 34.92 34-57.P4 82-50.44 0.90 .12 0 164 3.3 0.01- 0.1 0.6 R1 761115 P216 24.63 34-57.10 87-57.14 0.63 .60 6 19A 2.4 0.01 0.1 0.8 Cl 761127 649 5.30 34-56.70 82-55.15 -3.59 .86 5 lol 3.4 0.01 0.2 0.2 C1 761130 1651 13.30 34-s9.?3 92-59.11 1.60 .60 6 194 2.9 0.04 0.5 1.3 C1 76170? 10 2 10.11 34-58.41 87-57.73 0.42 .11 7 177 3.5 0.11 0.6 2.6 C1 761704 14?1 42.07 34-54.16 82-59.95- 2.27 1.32 6 P61 4.7 0.01 0.1 0.2 C1 76120; 113 23.64 34-97.42 82-54.54 0.99 1.44 7 179 3.9 0.02 0.1. 0.4 R1 761205 353 22.77 34-55.70 87-56.76 2.45 .60 8 20? 0.A 0.05 0.3 0.4 Cl 761?O6 431 19.41 34-57.82 82-58.65 1 60 .11 6 168 3.0 0.01 0.1 0.3 B1 761213 2024 24.77 34-56.43 UP-56.15 0.34 .60 6 116 P,0 0.02 0.? 0.7 01 761?)6 938 0.11 14-56.96 82-56.14 1.44 1.18 6.727 ?.? 0.01 0.2 0.3 Cl 761217 052 53.91 34-56.35 82-56.14 0.94 1.27 6 14? P.0 0.nl 0.1 0.5 01 7.',1 ;1 ; '20 1.7*,.m-re. ' . "
- 62-d6.!" Uen ,44 n 143 1.9 0.01 0 . T. 11.1 C' 761219 354 47.31 34'-57.45 82-56.41 2.31 .60 6 192 3.3 0.0? 0.2 U.3 C1 761278 940 13.03 34-56.76 8P-56.17 3.57 .11 8 117 P.4 0.05 0.3 0.6 01 770114 OP0 54.71 34-54.28 S2-56.00 1.78 1.32 7 130 ?.4 0.04 0.4 1.1 81 770114 026 PP.52 34-58.54 87-54.95 2.96 1.64 6 186 2.4 0.02 0.3 0.4 C1 770115 345 24.32 34-57.07 82-58.96 0.65 .11 8 177 2.6 0.03 0.1 1.8 R1 770117 534 14.13 34-57.50 82-58.08 0.76 .01 6 214 2.3 0 03 0.5 2.6 C1 770117 P222 59.01 34-57.47 87-59.67 0.73 1,32 6 151 2.R 0.06 0.1 1.7 81 770121 1241 30.49 34-56.91 82-57.23 0.16 .24 8 108 2.0 0.16 0.4 1.? B1 770123 054 43.6? 34-59.6a 82-55.30 1 78 .60 7 255 0.9 0.16 2.1 1.6 C1 77020? 1725 20.35 34-57.87 8?-57.00 1.76 1.37 8 133 3.6 0.04 0.2 0.8 01
'770707 2356 21.63 34-56.68 82-57.31 1.03 44 8 100 1.7 0.02 0.2 0.4 B1 770204 2348 49.27 34-54.24 RP-57.67 1.53 .40 6 163 3.7 0.00 0.0 0.1 91 770209 24 52.67 34-57.62 82-69.21 0.05 .12 0 170 2.1 0.04 0.3 0.7 81 770206 2154 ll.P7 34-94.72 62-56.?2 0.06 1.93 8 lla 2.3 0.14 0.7 1.9 91 770200 312 34.97 34-56.71 82-56.11 1.80 .60 6 153 1.9 0.02 0.1 0.2 UI 770209 1943 7.98 34-96.25 82-55.97 0.34 .57 8 152 2.1 0.04 0.2 0.5 B1 770710 1 7 13.52 3<.-s6.20 87-56.03 1.47 .60 8 155 P.0 0.03- 0.2 0.5 R1 770210 253 25.79 14-56.31 82-56.07 0.00 .11 8 146 2.0 0.01 0.1 0.3 G1 770713 1331 23.39 34-57.76 87-54.74 0.45 .E4 8 167 2.9 0.02 0.1 0.3 81 770213 1636 29.37 34-57.90 82-54.48 0.41 .21 ,6 257 4.1 0.02 0.3 0.6 Cl-77021'4 621 5.41 35- 1.11 87-56.28 2.74 .A2 7 29? 2.9 0.03 0.5 0.3 Cl 770217 22 7 6.73 34-59.13 82-58.06 0.02 1.10 5 16n 4.1 0.02 0.1 29.8 D1 770P14 452 34.14 34-57.49 82-57.86 1.75 1.3P A 154 3.9 0.c4 0.4 1.8 81 ' 770?)A 611 4.43 34-59.43 82-53.41 2.70 .40 6 ?61 3.n 0.01 0.1 0.2 C1 770?ln 939 P.76 34-57.97 n?-56.59 1.92 .40 8 125 3.2 0.04 0 . P. 0.6 01 770220 346 13.77 34-56.?0 AP-56.65 0.51 .40 6 139 1.7 0.02 0.3 3.0 Cl 770??0 937 41.17 34-97.13 82-56.56 1.68 .40 6 190 P.7 0.02 0.2 0.5 C1 770221 1743 41.73 34-57.21 87-56.45 1.93 1.32 6 165 2.9 c.00 0.0 0.1 81
- e. s f 33 i o
CSSSEE EARTHQUAKES FROM PCTOBER 28, '76 TO FEBRUARY 28. '77 1.10 .21 6 162 2 9 0.02 0.2 1.0 B1 7702?1 2111 Pl .mi 34-57.19 82-56.39 82-56.3A ?.65 .86 6 145 1 5 0 01 0.1 0.2 01 1.4 81 7702?? 253 40.59 34-56.24 8P-99.05 0.69 01 8 151 2.P 0.03 0.1 7702P2 532 32.35 34-57.36 .86 7 110 2 8 0 23 0.1 0.4 B1 7702?2 842 19.54 34-56.45 87-56.09 0.05 0.4 0.6 C1 82-53.05 2.75 .37 9 269 4.3 0.04 770223 7 8 49.08 34-59.52 2.25 5 103 1.A 0.01 0.2 0.5 C1 770223 850 7.92 34-57 19 82-56.43 1 55 0.1 0.2 C1 82-56.34 1 53 .86 8 148 14 0.02 770223 855 4.A9 34-57.21 .37 10 105 1.A 0 02 0.1 0.1 B1 770223 94 32 49 34-57.26 82-56.38 1.58 0.6 C1 07-55.n3 1 47 .40 6 278 2.5 0.03 0.4 77022*. 145G 19.30 34-57.19 14A .24 9 102 1.A 0.03 0.1 0.3 B1 770?23 15 4 4?.15 34-57.29 AP-56.53 HP-56.19 2.40 .40 6 198 1.9 0.01 0.2 0.2 C1 770723 1937 45.31 34-97.18 1.37 10 111 2.0 0.04 0.2 0.6 B1 770224 356 5.98 34-57.30 8?-56.18 1.03 82-57.34 1.00 1.02 11 147 0.P 5.92 24.0 28.5 D1 770?24 633 55.38.34-58.02 82-56.64 0.94 .86 6 179 2.2 0.01 0.3 0.7 R1 770225 259 63.64 34-58.08 82-56.17 0.32 .86 a 236 1.9 0.01 0.2 0.3 C1 770223 32. 50.71 34-56.35 1.72 .60 8 111 2 2 0.02 0.1 0.4 81 770225 1226 19.03 34-57.17 R2-56.13 62-56.52 2.37 .29 6 189 1.6 0.02 0.4 0.4 C1 77022% 1712 38.96 34-57.37 0.16 .11 8 216 2.4 0.02 'o.1 0.2 C1 770725 1913 1 97 34-57.09 82-56.04 1.53 6 190 1.7 0.02 0.5 0.7 C1 77072A 135 1 10 34-57.15 6?-56.54
.86 93 .99 ^ ?o7 A.) 0.?0 7.2 25.1 01 7?0??A 615 1.23 34-56. 3 h-53.24 1.89 .01 10 lin 2.0 0.99 0.3 1.0 91 7702P1 610 42.21-34-57.45 B2-56.04 1.07 .86 6 120 2.1 0.01 0.1 0.3 31 77022A 049 47.13 34-57.47 8?-55.94 0.36 .24 8 196 1.3 0.09 10 1,2 C1 77022n 632 54.29 34-56.51 8P-57.41 0.61 .40 8 182 14 0.01 0.1 0.6 C1 770229 740 3n.51 34-56.59 R?-57.27 n?-56.56 1 54 .12 3 137 1.3 0.04 0.3 0.7 01 77022A 2315 15.76 34-56.27 i
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