ML20136E693

Seismic Activity Near VC Summer Nuclear Station for Period Apr-June 1985, Technical Rept

ML20136E693
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Site:	Summer
Issue date:	06/30/1985
From:	Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
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85-2, NUDOCS 8601070100
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- . _ _ - . . _-

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TECHNICAL REPORT 85-2 SEISMIC ACTIVITY NEAR

. THE V.C. SUMMER NUCLEAR STATION For the Period April - June 1985 1

by Pradeep Talwani Principal Investigator Geology Department University of South Carolina Columbia, S.C. 29208 Contract No. N385310 0601070100 e601o3 i

DR ADOCK 0500 5

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TECHNICAL REPORT 85-2 SEISMIC ACTIVITY NEAR THE V.C. SUMMER NUCLEAR STATION FOR THE PERIOD APRIL - JUNE 1985 BY PRADEEP TALWANI PRINCIPAL INVESTIGATOR , ,

AND CYNTHIA S. EVANS RESEARCH ASSISTANT GEOLOGY DEPARTMENT UNIVERSITY OF SOUTH CAROLINA COLUMBIA. S.C. 29208 CONTRACT NO. N230519

INTRODUCTION This report presents a summary of seismic activity near the V.C. Summer Nuclear Power Station in South Carolina for the three month period between April 1 and June 30, 1985. During this period, a total of 167 events were recorded of which 127 were located. One of the events had a magnitude equal t o 2.0, and seven had magni-tudes between 1.0 and 2.0, and the remaining events were small (Mg < 1. 0 ) . Most of the located events (84%) were sha l l ow (< 2.0 km) .

SEISMIC NETWORK The report is based primarily on data recorded by the four station network operated by S.C.E.&0. and the USGS/USC stations JSC. 6A and 7. 'The locations of the stations are shown in Figure 1 and their coordinates are listed in Appendix I.

DATA ANALYSIS Hypocentral locations of the events are determined by using the NYP071 program (Lee and Lahr, 1972) and the velocity model listed in Appendix II. The event magnitude (Mg) is determined from signal duration at station JSC.

using the following relation:

Mt = -1.83 + 2.04 Log D where D is the signal duration (seconds).

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3 An estimate of daily energy release is determined using a simplified magnitude (Mg) energy (E) relation by Gutenberg and Richtar (1956).

log 10 E = 11.8 +

1.5 Mt .

OBSERVED SEISNICITY FOR THE PERIOD APRIL-JUNE, 1985 The summary listing of the HYP071 program for the 127 located events recorded between April 1 and June 30, 1985 is given in Appendix III. During this period the celsmicity remained high with little change from month to month. Over this three month period there were 7 events with magnitudes > 1.0, and 10 events with depths > 2.0 km.

The seismic activity for the three month reporting period was located in tho south ce-tral portion of the reservoir area. A cumulative plot of epicenters of events located during this period is shown in Figure 2 and a cross section of events located within 1.5 km on each side of line AA' and line BB' is shown in Figure 3. The events in the cross section appear to define a clustering in the upper 2 km with some deeper events. Cross sec tion BB' shows those same events on a line perpendicular to line AA' extending 2.5 km on each side. Separation of epicentral locations by month are shown in Figures 4-6.

For depth analysis, only B quality events were considered. In the first six months of 1985, 87% of the events located above 2 km (Figure 7A). For the three month periods January-March and April-June, 1985, 88% and

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13-83% of the events occurred above 2 km. respectively (Figures 78 and 7C). In each graph. events greater than 3.0 km were plotted-together in the depth range 3.0 to 3.5 km. Map views with cross sections for each corres-ponding time period are shown in Figures 8-10.

RESERVOIR WATER LEVEL AND ITS COMPARISOE WITE SEISMICITY Monticello Reservoir is a pumped storage f acility.

Any decrease in reservoir level associated with power generation is recovered when water is pumped back into the reservoir. There can be variations up to about five feet per day between the maximum and minimum water level. We have been monitoring this water level to see if there is any correlation between the daily or seasonal changes in the reservoir level and the local seismicity. Figure 11 shows the comparison of water level to seismicity. The top two graphs show the water level and the change of water level per day. The log of energy released per day

- and the number of events per day are shown on the lower two graphs. These histograms include the unlocated events around the reservoir.

CONCLUSIONS In a continuation of the pattern observed in the first quarter of this year, the level of seismic activity l from April through June of 1985 remained high. For the I

l first six months of 1986, the level of seismic activity i

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15 averaged 17 events per week compared to 12 events per week in 1980 and only 3 events in 1984 (Figure 12). The monthly variation of seismicity since 1980 (Figure 13, enlarged scale) or since impoundment in 1977 (Figure 14) shows some interesting features.

Af ter a period of declining seismic activity from

~

1978 to 1984, Monticello Reservoir experienced an abrupt

, increase in seismicity in 1985. Much of the activity for the period April-June, 1985, as also in earlier periods, occurred in discrete swarms. As with earlier swarms, most of the events were small (Mg< 2.0), and most (84%) occur-red in the uppermost 2 km.

REFERENCES Gutenberg, B. and Richter, C.F. (1956). Magnitude and energy of earthquakes, Ann. Geof. 9,

p. 1-15.

Lee, W.H.K. and Lahr. J.C. (1972). A computer program for determining hypocenter, magnitude 4 and first motion pattern of local earthquakes, Revisions of HYPO 71, U.S.G.S. Open-File Report, 100 pp.

I

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M 1978 1979 1980 1981 1982 1983 1984 1985*

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17 4

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APPENDICES e

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APPENDIX I STATION LOCATIONS NO STN. LAT.*N LONG. *W 1 001 34* 19.91' 81* 17.74' 2 002 34* 11.58' 81* 13.81' 3 003 34* 21.09' 81* 27.41' 4 004 34* 25.72' 81* 12.99' 5 - JSC 34* 16.80' 81 12.99'

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1 APPENDIX II MONTICELLO RESERVOIR VELOCITY MODEL Velocity Depth to. top km/sec km 1.00 0.00 5.40 0.03 5.90 0.18 4

, 6.10 0.46 1

6.30 0.82 I

8.10 30.00 e

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APPENDIX III f!ONTICELLO LARTHOUAKLS APRIL - JUNE 1985 DATE 'sRIGIN LAT N Lt1HG H DEPTH f1AG NO GAP DPilN RftS ERH ERZ GM B50401 15e6 6 -

71 1.83 82 9 134 1.8 0.08 0.5 850401 to53 45 22 70 34-19.38 34-19.49 6'l 81-1 18 .78 0.98 0 95 10 141 1.8 0.06 0 0.4 1.0 81 1.2 B1 850401 1654 14.72 34-21 10 81-1 84 1.31 -0.11 6 247 2.2 0.03 ,0.4 0 850401 19 9 31 16 34-19 54 1 . 81-1 05 1.93 -0.11 7 131 7.3 0.05 0.3 29C1

.2 B1 650401 19e1 52 85040, 1996 45 96 81-1 00 1.99 0.37 7 130 7.6 0.07 0.4 77 34-19.68 34-19.50 81-1 82 n 05 0.87 to 130 1.8 0.09 .0.a 2.8 1.4 61 61 85040: 1955 58.03 34-1 49 81-1 84 1.2o -0.86 5 225 0.8 0.04 850402 141 10.09 34-1 73 81-1 88 0.53 1.0 0.7 C1 850402 1933 1.93 34-1 .25

. 0.37 13 115 1.8 0.09 0.3 0.8 81 81-1 90 1.04 -0.Bo 8 246 2.2 0.04 0.5 0.8 C1 850403 S$9 4o.96 34-1 64 81-1 55 0.87 850403 19 34- .56 81-1 61 74

-0.24 12 109 1.3 0.04 0.1 0.4 B1 546 50 850403 714 46 43 34 11 .61 81-1 97 01.72

.22 12 11 1 2 50 0.08 0.3 e 0.6 61 850403 941 3.lo 34-1 .59 81-1 . 23 1.81

.22 10 18 0.07 0.4 0.6 C1

-0.40 13 to 1.0 0.05 0.2 0.3 61 850405 11 8 32.95 34-1 .08 81-1 76 0.04 -1 83 5 240 3.5 0.09 1.4 2.3 C1 850403 11 9 30.83 T4-1 96 850403 15 3 6.90 34-1 .35g 81-1 .o1 0.25 -1 83 6 238 3.4 0.03 0.3 0.5 C1 81- . o ?. 1.97 -0 6 214 3.1 0.04 0.4 0.7 C1 850403 1633 5.37 34-1 81- 64 0.85 -0 86 40 6 233 3.0 0.05 0.7 9.7 D1 850404 348 5.38 34-L 93 81- 84 1.83 -0.86 9 143 0.2 0.07 0.6 0.4 B1 850404 16 63 81-1 72 1 1 02 to 149 1.6 0.03 0.2 0.3 81 850404 5384d20 20 9334-L9*28 34-2 81-1 95 2 59 87 ' -0 60 8 184 0.8 0.01 850404 1442 12.54 34-1 ,27 81-1 .03 0.05 -0 8 135 2.3 0.08 0.2 0.1 C1 w 850404 2 27 14.76 34-1 .31 81-1 .19 0.86 -0 24 4 237 1.3 0.04 0.4 1.0 61 N 60 0.0 0.0 C1 85040S 850410 2 14 40 12.16 34-2 .01- 81-1 57 1.96 -0.86 6 159 0.3 0.06 3.3 0.6 D1 1.79 34-2 .48 81-1 94 29 -1.22 8 188 1.1 0.03 1.4 0.2 C1 dS0410 12 8 5.41 34- 42 81-1 .o7 2

0. 54 -0.86 6 215 3.1 0.07 1.0 3.0 C1 850410 1235 45.62 34- 41 81-1 44 1.79 -0.86 6 210 2.7 0.06 3.3 5.9 D1 850410 1745 18.lo 34-850411 11u8 18,68 34-1 45

. B P, 81-1 00 2.o6 0.82 11 195 1.7 0.0o 0.4 0.4 C1 81-1 50 1.89 1.34 1d 132 2.8 0.07 0 0.9 61 850411 1750 53.90 34-20.01 850412 13d3 1.72 34-19.47 81-1 50 81-1 55 3.52 -0.86 5 188 0.3 0.05 93.3 0.7 01 0.03 -1.22 5 232 2.9 0.02 0.4 0.1 C1 850412 1416 23.74 34-2 .28 81-1o.77 0.72 -0.60 8 233 2.9 0.06 0.6 0.9 C1 850417 1044 55.98 34- 8o 81-1 77 0.91 -0 4 179 0.1 0.00 0.0 0.0 C1 850417 1648 0.44 34- .19 81-1 65 0.21 -0 8o 6 243 3.1 0.09 0.2 0.4 C1 850416 1049 42.55 34- 0.01 81-1 84 3.14 -0 24 40 6 173 0.2 0.05 1.4 0.3 C1 850419 11 4 43.63 34-22.33 81-1 34 0.68 -0.86 9 254 1 0.8 0.'7 C1 850421 012 14.13 34-21.55 81-1 24 . 1.72 0.91 8 249 38 .1 0.08 0.07 1.0 1.0 C1 850430 18s2 37.13 34- 52 81-1 83 0.80 0 9 130 5.1 0.09 0.3 2.2 61 850430 1958 11 02 34- 90 81-1 43 1.37 -0 37 40 5 196 1.1 0.02 0.2 0.2 C1 850501 410 31.e2 34- 85 81-1 84 1.46 -0.60 6 172 0.2 0.04 0.4 0.3 01 850510 14 34- 9.15 81-1 84 1.70 -0.86 4 210 1.4 0.04 0.0 0.0 C1 850511 2395 112 22 32.74 34- 9 81-1 36 0.01 -0 4 251 2.6 0.04 0.0 0.0 C1 850517 149a 20.85 34- 19 50 890517 1557 T4.tn Tu 'Q IT 40 81-1 31 1.59 -0 60 11 11 128 1.3 0.07 0.3 0.5 81 81-1 .20 f.67 -0 86 6 270 2.7 0.03 0.6 0.6 C1

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