Text

Technical Rept 94-3, Seismic Activity Near VC Summer Station for Period Jul-Sept 1994
	ML20080H673
Person / Time
Site:	Summer
Issue date:	09/30/1995
From:	Cobb J, Talwani P; SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
To:	;
Shared Package
ML20080H672	List: ML20080H673; RC-95-0041, Forwards Technical Rept 94-3, Seismic Activity Near VC Summer Nuclear Station for Period Jul-Sept 1994;
References
	94-3, NUDOCS 9502230229
	Download: ML20080H673 (15)
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y TECHNICAL REPORT 94-3 SEISMIC ACTIVITY NEARTHE V.C. SUMMER NUCLEAR STATION FOR THE PERIOD JULY-SEPTEMBER,1994 BY PRADEEP TALWANI Principal Investigator.

and Jason S. Cobb DEPARTMENT OF GEOLOGICAL SCIENCES

' UNIVERSITY OF SOUTH CAROLINA COLUMPIA, SOUTH CAROLINA 29208 CONTRACT NO. N622702

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1 JCm INTRODUCTION -

[3J TAnalysisLof. the'selimic' activity near the V.C. Summer N.uclear StationLin ~ South

~ Caro!ina between July 1 and' September 30,1994 is presented in this report.J During this

,ch i

T?; ; period, seven events were recorded in'the vicinity of theLMonticello Reservoir, all of1 ,

W which were located.; Fiva af the events were of rciatively small magnitude (< 1.0) while c

' two events were 'of mod. cate magnitude,1.54 and 2.16, respectively. - ,

~

SEISMIC NETWORK- j l

Earthquakes during this period were, recorded on stutions.of Monticello' Reservoir arid i %

^ South' Carolina. Seismic Networks. The. configuration of stations' utilized to. locate ~

~

~i

. 'Monticello Reservoir events is shown in Figure 1 and station ' coordinates are listed in>

' l Appendix L The operational status of the network is given in Appendix IL j

DATA ANALYSIS ,

X

- Hypocentral locations have been determined. using the computer program HYPO 71 -

(Lee and Lahr,1972). The velocity model used in the earthquake locations is given in

];

Appendix III. The format of the HYPO 71 output is given in Appendix IV. The event :

C' magnitude was determined from the signal duration at JSC using the follo' wing ;

relation. ;

~ ML = -1.83 + 2.04 Log ,

3 where D is the signal duration (seconds). I An estimate of daily energy release was determined using a simplified magrdtude (ML). d energy (E) relation by Gutenberg and Richter (1956): 4 j

Logio E = 11.8 + 1.5 Mt OBSERVED SEISMICITY DURING JULY-SEPTEMBER,1994 -

j Seismicity around Monticello Reservoir was low during th'e third quarter of 1994. l Seven events were recorded and located (Figure 2). All events for the qur 'er.were !

j shallow and varied in depth between .09'and 3.0 km. The largest event occurred on July 23,1994 at 01:12:15 UTC and had a duration magnitude of 2.16 (Appendix V). Three )

events occurred within a six day period between July 23 and July 28,1994 (Appendix V). j Three events occurred within a six day period between August 9 and August 14,1994 )

(Appendix-V). Four of the' events were located in the northwest area of the reservoir (

near station MR07. Two of the events were located near' station MR10 while the -

remaining event was located in the southeast area of the reservoir between stations JSC.

and MR01 (Figure 2). All of the event locations were of fair quality (Appendix V). _ The

, 'long term decline in seismicity observed at Monticello Reservoir is continuing (Figure

3) and the c.imulative' seismicity has shown relative flattening since 1985-86 (Figure 4).

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f, SCORRELATION OF WATER LEVEL _WITH SEISMICITY I_ , Monticello Reservoir l's a pumped storage facility. Any decrease in the reservoir Ihvel

. associated'with power generation is recovered when water is pumped back intolthe- '

reservoir. There can be normal variationssup to five feet per day between maximum -

and minimum water levels. The water level' has been monitored to see if there is any?

y correlation between the daily or seasonal changes in the reservoir level and. the local seismicity. Water levels are compared with seismicity in Figure 5. The top panel shows

- ; the average water level; the enor bars show the maximum and minimum water levels -

4' each day. The second panel shows the change in' water level from day. to day. The ;

number of events per day and the log of energy released are;shown in the lower- '

g- histograms. These charts include all reported earthquakes listed in Appendix V. - The .

- average water level,- daily changes in~ water level, number of earthquakes and energy;

~

. 3 release are given in Appendix VL No systematic correlation was observed between the . .

, seismicity and reservoir level fluctuations. .

CONCLUSIONS

. Seismicity during the third quarter of 1994 was low and occurred generally in the.

eastern section of the reservoir near Stations MR07 and MRIO, with the exception of an..

event on. the southeast flank. No systematic correlation was ' observed between the' ..

reservoir level fluctuations and the. seismicity. ,

i REFERENCES ,

Gutenberg, B. and Richter, C.F. (1956). Magnitude and energy of earthquakes.' Ann. !

Geof. 9,1-15. i i

Lee,- W.H.K. and Lahr, J.C. (1972). A computer program for determining hypocenter, ,. i magnitude and first motion pattern of local earthquakes, revisions of HYPO 71, .. ;l U.S. Geological Survey, Open-File Report,100 pp. ;

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$ 3 component Figure 1 Location of Monticello Reservoir seismic. stations.

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Figure 2. Events located near Monticello Reservoir during the period July - September 1994 (stars) i I

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1977 1979 1981- 1983 1985 1987 1989 1991 1993 Figure 3. - Earthquakes between impoundment and September,1994.

t CUMULATIVESBSMICITY

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l l l l l l l l l l l l l ! l l 0 1977 1979 1981 1983 1985 1987 1989 1991 1993-Figure 4. Cumulative seismicity near Monticello Reservoir since impoundment.'

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1 JULY 1994 / AUGUST 1995 / SEPTEMBER 1994 i Figure 5. Comparison of daily lake level, changes in lake level, number of earthquakes and the log of energy release in ergs per day at Monticello Reservoir. Error bars in the top panel indicate daily fluctuations in water level.

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if ' APPENDIX I i

.r STATION.. LOCATIONS.. ,

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'1 STATION ' LAT* N' 'LONG'W

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JSC 34:1G & ' 81 15.60'- :'

-l MR01 34'19.91' 81'17.74' .

y MR02 34 11.58' 81 13.81' ;

MR05 34"16.05' 81 20.05'-

l MR07 34 22.23' 81 19.50' MRIO 34'20.18' 81*20.25

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- APPENDIX ! II:

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. SEISMIC STATION OPERATIONAL STATUS--

-JULY l'- SEPTEMBER 30,1994

\ b k r, STATION PERCENT DOWNTIME .

MROI - 0.0 .

MR02- 0.'0 ,

. MR05 100.0 MR07 5.4 MR10 9.8 JSC oo 1

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APPENDIX-III zg[ MONTICELLO RESERVOIR

VELOCITY.MODEL y.

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_ Velocity Depth to top-km/sec km-p i '

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5.40 0.03

' 5.90 0.18 l-l 6.10 0.46 6.30 .0.82 8.10 30.00 O

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, ' APPENDIX IV MONTICELLO EARTHQUAKES HYPO 71 FORMAT

' Column 1 Date Column . 2 ~ Origin time (UTC) h.m.sec.

Column ' 3 Latitudi(N) degrees, min.

Column 4 Longitude (W) degrees, min.

Column 5 , Depth (km).

Column 6 Local duration magnitude.

Column 7 No. of str. don readings used to locate event. P and S arrivals from same stations are regarded as 2 readings.

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 = Ri 2/No, where Ri is the time residual for the ith station.

Column 11 Standard error of the epicenter in km*. -

Column 12 Standard error of the focal depth in km*.

Column 13 Quality of the epicentral location.

Statistical interpretation of standard errors involves assumptions which may not be met in earthquake locations. Tl:erefore standard errors may not represent actual error limits.

Note: If ERH or ERZ is blank, this means that it cannot be computed, because of insufficient data.

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~ APPENDIX V .

MONTICELLO RESERVOIR EARTHQUAKES JULY'- SEPTEMBER,1994 DATE ORIGIN- LAT N LONG W DEPTH ' MAG NO CAP DMIN RMS ERH--ERZ O'M, 940723 112 15.94 34-21.83. 81-21.64 6

0.09 2.16 10 290 .3.4 0.04~ 0.8 1.3 ' c 1.

, 940725 1211 39.73 34-22.33- 81-19.60 '2.21 0.21 8 344 0.2 0.04 1.4 0.3 C 1 i -

940728'16 4 31.50 34-18.29 81-15.70- 2.68 1,54 6 213 2.8 0.03 2.2 ,0.8 C 1-940809 945 47.63 34-19.89 .81-20.35 0.91 .-0.86 -4 248 0.6 0.03: C=1 940810 233 20.48 34-22.29 81-21.35 2.95 -0.60 6 332 4.3 0.06 2.2 1.8 C 1 940814 1258 19.27 34-19.45 81-20.21 1.12 -1.22 4.232 1.3 0.01 C1 940830 1257 47.5& 34-22.33 81-20.31 3.00 -0.86 4'314 1.2 0.03 C1 is.

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1 1 APPENDIX VI m , 4 ,

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c : Maximum'and minimum water levels, change in water;Ievel,: number -

of:* earth. quakes and log ;of;energyf release per dayf atl Monticello r o

Reservoir during ; LJuly 1- September 30,- 1994; ; Dates:are givent in " _-

M4 -

1 g(Julian'

(

Calendar 1 n

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E,; ' J.DATE WL (max) -. WL (min) J WL (avg) ~ WL (ch) # of eqs~ Energy ,

1182 -424.3: 422.3: '423.6 '- 0.7 - 0 'O-

.183 424.5 422.8' -424.1 0.5 0. 'O ,

g> . 184 424 422.9' 423.7 -0.4 0 10 -

423.6 0.

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185 422.9 ~ 423.51 -0.2 0 -

.l "N -186' 424.8 -422.8 424.1 0.6 01 0-

, 187' 424.4 421.5- ~423- -1.11 : 0.- 0-

'188

'424.7 . 421.2 423.1- - 0.1 0 10 o 189 424.7 421.4 422.9 -0.2 0 0 190- 424.9' 421.9 -423.4 0.5 - 0 0- i

, 191 - 424.9 422.3 423.6.: 0.2 0. 0-1192 .424.9 - -421.6 423.5 -0.~ 1 0 0- -

193 424.9 422.2 423.5 0 "O .0 194 425 421.4 423.4 -0.1 0 -0 ,

195 425 421.4 '423.3 -0.1 0 0 196 424.7 420.6 -422.8 -0,5 0 :0

'6 9 7 ~ 424.8 421.3 423. 0.2 :0~ l0 198- 424.9 ,421.3 423.4 - 0.4 :0' O. .

199' 424.9 421.7 423.3 -0.1' 'O 0?

200- 425 .422.3 423.6 0.3~ 0~ . 0 '

201 424.9- 422.1 423.6 0' <0' 0' >

202 424.9- 420.9- 423.1 -0.5- 0 ~0 -!

203' 424.6 421.4 423.3 0.2 0 - 0 204 424.9 422.1 423.7- 0.4 1 15.04. ,

205 424.8' 422 423.7 0 0 0 206 .424.9- 421.7 423.5 -0.2 1 12.12-207- 425 ~ 422.5 424.1 0.6 ;0 0 208 424,9 423.9 '424.5 0.4 1 0 0 209- 424.1 423.8 - 424 0.5 1 14.11 "

210 424.3 423.2' 423.8- -0.2 0 0 211 424.5- 423.4 424.1 0.3- 0 '0 '!

212 '424.6 424 424.4 0.3 0 0 -

213 424,9 424.1 424.5 -0.1. 0 0 214 424.9 421.4 423.7 0.8 0 0 215 424.9 422 423.5 -0.2 0 -0 ;

216 424.9 422 423.7 0.2 0 0 M 217 424.9 422.3 423.6 -0.1 0' 0 218 424.8 422.4 423.9 0.3 0 0 219 434.2 423.2 424 0.1- 0 0 .

220 424.9 423.8 424.5 0.5 0 0 221. 424.9 423.7 424.3 -0.2 1 ~ 10.51 e 222 424.8 422 423.8 -0.5 1 10.9 223 425 422.8 424.1 0.3 0 0

- 2 P.4 ' 424.8 421.8 423.5 -0.6 0 0

, 1 225 424.2 422.3 423.4 -0.1 0 0 226 424.8 423' 423.9 0.5 1 9.97-

. 227 425 423' 424 0.1 0 0 13 ,

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( tf j[ t m T J.DATE WL(max) WL(min) WL(avg) WL(ch) # of eqs . Energy

228 '424.5 422.2 423.7- -0.3 0 229 422.3 .422' 422.2 .-1.5 0 0-

, 230 422 '422 422 -0.2, 0 0' '

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. l' -231- 422.2 422 422.1. 0.1: 0 'O' 232 422.6' -422.1 422.4- 0.3 'O .0:

233 '424.5 422.9 424- 1.6 0 '0' ,

234 424.7 423.1' 424.2. ~ 0.2 - 0 0 y 235: 424.9 423.5 424.3 0.1 .0, 0 236 '425 423 424.3 0 0 0 237 425 423.1 424.1 -0.2- 0: 0

i. 2381 425 422 423.7 -0.4 0 0' 239 424.8 422.1 423.4 -0.3 0 0 240 424.3 422 423.2 -0.2 0 0

, 241 424.5 422.4 -423.6 0.4- 0 0~ ~>

. 242 424.9 422.1 423.7 0.1 1 -10.51 243 425 421.8 423.7 0 0- 0 244 424.9 421.7 423.4 -0.3 0 0 245 '424.4 422 423.5 0.1 0 0 246 424.3 '422.3 ~ 423.6 '0.1 :0- 0

.- '247 425 422 423.8 0.2 .0 0 248 425 421.7 423.4 -0.4 0- 0 o 249 425- 422.1' 423.9 0.5- 0 0 250 425 422.5 423.9' O O ;0 251 425 423.2 424.2 0.3 0 0 252 424.8 ~ 423.3 424.1- ' -0.1 0- 0 253 424.9 422.9 424 -0.1 0 l0.

254 424.9 422.7 423.8 -0.2 0 0.

255 424.9 422.3 423.8 0 0 0 256 425 421.9 423.7 -0.1 0 0. -

257 424,9 422.1 423.7

-O O '0 258 424.8 422.1 ~423.6 --0.1 0 0.

259 424.8 421.8 423.6 0 0 0 260 424.6 421.6 423.3 -0.3 0 0 -.

261 424.4 421.9 423.2 -0.1 0 0' 262 424.9 422.6 424.1 0.9 0 0 E 263 424.8 423.6 424.3 0.2 'O O' 264 424.7 423.4 424.1 -0.2 0 0 265 424.9 422.2 423.8 -0.3 .0 0' 266 424.8 422.6 423.7 -0.1 0 -0 267 424.5 421.7 423.3 -0.4 0- 0 268 424.7 422.2 423.5 0.2 0 0' 269 424.9 421.8 423.7 0.2 0 0 270 425~ 422.8 424.1 0.4 0 0

., 271 424.9. 423.5 424.3 -0.2 0 0.

, 272- 424.7 422.2 423.8 -0.5 0 0 273' '425 423 424.3 0.5 0 0 14

.-. .-. . .

ML20080H673

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