ML20078C152

Seismic Activity Near Virgil C Summer Nuclear Station Jan-Mar 1983

ML20078C152
Person / Time
Site:	Summer
Issue date:	03/31/1983
From:	Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
To:
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ML20078C128	List: ML20078C125 ML20078C138 ML20078C152 ML20078C157
References
83-1, NUDOCS 8309270441
Download: ML20078C152 (21)

Text

.

Technical Report 83-1 I

SEISMIC ACTIVITY NEAR THE V. C. SUPEER NUCLEAR STATION t

For the Period January - March 1983 l

by i

Pradeep Talwani i Principal Investigator Geology Department University of South Carolina Columbia, S.C. 29208 Contract No'. N230519

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1 INTRODUCTION This report presents a sumary of seismic activity near the V. C. Sumer Nuclear Power Station in South Carolina for a three month

,. period'between January 1 and March 31, 1983. During this reporting period, a total of 88 locatable events were recorded. The largest magnitude recorded was Mt = 2.0 on February 19, 1983. Four events were recorded with magnitudes between 1.0 and 2.0 and are listed below.

Date Magnitude January 31 1.50 February 8 1.09 February 9 1.06 February 20 1.24

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SEISMIC NETWORK

, The report is based on the data recorded by a four-station network operated by S.C.E. and G. In addition, data from a pemanent station (JSC) of the South Carolina seismographic network are also used.

Location of all these stations is shown in Figure 1, and their co-ordinates are listed in Appendix I.

DATA ANALYSIS Location of the events is detemined using HYP071 program (Lee and Lahr,1972) and the velocity model given in Appendix II. The event magnitude (M L

) is determined from signal duration at station JSC, using the following relation:

M = -

1.83 + 2.04 Log D L

where D is the signal duration (seconds).

An estimate of daily energy release is determined using a simplified

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log 10E = 11.8 + 1.5 ML RESULTS

, Th'e'88 located events recorded during this period are listed in Appendix III. One event was of magnitude 2.0, four had magnitudes between 1.0 and 2.0, and the remaining events were of magnitudes below 1.0. The largeevent(ML = 2.0) on 2-19-83 was relocated using data on other sta-tions of the Monticello and S.C. Seismic Network. Its depth was found to change from 1.75 km to 0.45 km. Depth estimates indicate approximately 63% of the activity was within 2.0 km depth,14% was between 1.0 and 2.0 km and the remaining events occurred below 3.0 km. Figure 2 shows the per-centage of events occurring in 0.5 km depth increments for this reporting period in comparison with the previous five years based on A and B

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quality events. Most of the activity occurs between 1.5 and 2.0 km

, depth, and the percentage of events at greater than 3.0 km depth is about the same as in 1982. However, as stated in previous reports, when past events were relocated using magnetic tape data, the depths were found to be lower than the true depths.

A cumulative plot of epicenters of events located during this reporting period is shown in Figure 3, a cross section in Figure 4, and a monthly breakdown of epicentral locations is shown in Figures 5-7. We note that most of the activity occurred in February and March and was concentrated in the middle of the reservoir.

, RESERV0IR WATER LEVEL AND ITS COMPARISON WITH SEISMICITY Monticello Reservoir is a pumped storage facility. Any decrease in

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reservoir level associated with power generation is recovered when water is pumped back into the reservoir. There can be variations up to about r

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10 5 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 8 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 number of events per day and log of energy released per day are shown on the lower two graphs. The histograms showing events per day and log of energy release include the unlocated events around the reservoir.

CONCLUSIONS Seismically, the Monticello Reservoir area during the January through March 1983, reporting period was more active than in the pre-vious six months. Figure 9 is a histogram of the number of events per month from December 1977 through March 1983, suggesting a long term trend of discrete swarms of seismicity separated by relatively quiet periods. The seismicity level for this period is consistent with the trend by indicating a swarm following a quiet period, with an overall de-crease in the level of seismicity. The majority of depths for the three month period continue to be in the 1.5 to 2.0 km range.

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 and first motion pattern of local earthquakes, Revisions of HYF0 71, U.S.G.S. Open File Report,100 pp.

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STATION LOCATION NO. STN. LAT. N. LONG. W.

1 001 34 19.91' 81017.74' 2 002 34011.58' 81 13.81' 3 003 340 21.09' 81027.41'

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- APPENDIX II MONTICELLO RESERVOIR

! VELOCITY MODEL Velocity Depth km/sec km 1.00 0.00

! 5.40 0.03 5.90 0.18 6.10 0.46 6.30 0.82

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[ . DATE 3RIGIN LAT N LONG W DPPIH MAG NO GAP D1IN RMS BRH ERZ 3R 830101 422 51.16 34-22.78 81-22.70 1.91 -0.85 6 238 7.9 3.00 0.3 0.0 C1 830128 14 2 9.82 34-26.96 81-17.03 1.97 -1.22 6 222 5.6 3.03 0.3 2.0 C1 830130 1656 21.18 34-21.03 81-21.37 4.25 0.21 5 145 5.9 0.01 0.2- 0.6 C1

] 830131 2114 2.53 34-19.65 81-22.66 1.05 -0.85 5 226 7.6 3.34 1.3 32.9 D1 830131 2149 34.88 34-20.31 81-19.54 0.72 -0.24 10 136 2.8 0.04 0.3 0.7 B1

. 830131 23 0 33.30 34-19.72 81-20.42 1.76 1.50 8 152 4.1 3.05 3.5 2.0 C1 830201 124 21.50 34-20.07 81-19.73 2.34 -0.40 7 176 3.1 0.01 0.2 0.3 81 830201 1021 4.56 34-20.28 81-19.78 2.59 0.43 8 135 3.2 3.06 0.3 1.1 C1 i 830204 1357 55.44 34-19.23 81-20.06 3.10 -0.40 10 141 3.8 0.08 0.4 0.8 B1 830205 848 58.87 34-20.31 81-20.25 1.77 -0.40 7 250 3.9 3.08 1. 2 2.1 C1 830205 20 0 43.01 34-17.62 81-19.78 1.99 0.95 10 158 5.3 3.04 0.2 0.8 B1 830207 239 24.41 34-27.16 81-20.63 0.31 -0.11 9 240 12.0 3.09 0.7 1.6 C1 1 830207 15 2 23.06 34-20.70 81-19.31 3.62*-0.40 10 133 2.8 0.08 0.3 0.6 B1 j 830208 06 28.54 34-20.79 81-19.31 0.49 1.09 8 134 2.9 3.03 3.2 0.6 B1

830209 118 17.46 34-20.79 81-19.40 2.83 -0.60 10 135 3.0 0.08 0.3 0.7 81

830209 310 57.62 34-20.84 31-21.14 2.84 1.05 9 141 5.5 3.08 0.4 1.1 B1 830211 2048 45.84 34-20.35 81-18.56 2.64 -0.11 6 245 1.5 3.05 0.9 0.4 C1 l 830212 336 4.71 34-20.22 81-21.48 1.97 -0.60 8 136 5.8 3.09 0.5 2.2 C1

! 830219 1421 17.14 34-20.06 81-20.14 0.35 -0.24 10 131 3.7 0. 03 0.1 1.2 B1

! 830219 1451 2.22 34-20.43 81-19.99 1.76 -0.24 10 131 3.6 3.05 3.2 0.7 B1 1 833219 1614 40.02 34-20.04 81-19.91 4.46 -0.40 8 130 8.9 0.03 0.1 0.5 B1 l 830219 1616 13.76 34-20.25 81-20.18 5.24 -0.24 8 130 3.5 3.04 0.2 0.6 B1 l 830219 1847 39.03 34-20.01 81-19.80 1.69 -0.86 10 130 3.2 0.06 0.2 0.8 B1 l 830219 1847 42.33 34-20.21 81-19.67 1.62 -0.60 10 127 3.0 3.03 3.1 0.4 B1  ?

! 830219 1847 50.60 34-20.39 81-19.51 1.92 -0.40 9 129 2.9 0.03 0.1 0.3 B1 l 830219 1848 7.33 34-20.35 81-20.00 1.76 -0.60 10 130 3.6 3.09 3.3 1.1 81 l 830219 1848 12.99 34-20.34 81-19.80 1.96 -0. 86 9 130 3.3 0.07 0.3 0.9 B1 O

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830219 1916 55.83 34-20.62 81-20.54 1.96 -0.60 10 136 4.5 3.06 0.3 1.'O 81 830219 1950 31.60 34-19.84 81-16.94 3.62 -0.86 7 133 1.4 0.04 2.0 4.3 B1

. 830219 2025 21.15 34-20.28 81-19.82 0.45 2.00 16 71 0.7 3.08 3.3 3.~6 A1 830219 21 8 39.93 34-17.46 81-19.17 3.85 -0.60 5 266 5.0 0.05 0.4 0.3 01 830220 1551 36.51 34-20.25 81-20.24 1.78 -0.11 10 130 3.9 3.08 3.3 1.1 B1 830220 2256 27.96 34-20.24 81-19.63 1.77 -0.40 8 254 3.0 0.08 1.1 ' 1.3 01 830220 2348 55.58 34-20.63 81-20.04 0.04 1.24 8 135 3.8 3.04 0.2 0.4 B1 830221 3 9 15.08 34-20.26 81-20.04 0.90 0.99 10 129 3.6 0.06 0.2 4.1 B1 830221 322 21.43 34-20.43 81-20.11 0.28 -0.40 10 132 3.8 3.05 0.2 0.5 B1 830221 749 58.03 34-20.54 81-20.12 0.31 -0.60 7 134 3.8 0.02 0.1 0.0 B1 830221 84 59.58 34-20.23 81-20.05 1.58 -0.60 6 129 3.6 3.02 3.1 0.4 81 830221 8 6 51.35 34-20.78 81-20.19 0.12 -0.24 7 137 4.1 0.07 0.2 0.6 B1 830221 8 9 38.27 34-20.38 81-20.17 1.78 0.21 10 131 3.8 3.06 0.2 0.9 B1 830221 810 25.13 34-20.79 81-20.09 1.34 -0.40 10 137 4.0 0.03 0.1 0.8 B1 830221 816 8.88 34-20.17 81-20.08 0.36 -0.40 10 130 3.6 3.07 3.3 1.1 B1 830221 817 32.37 34-20.29 81-20.07 1.72 -0.40 10 130 3.6 3.04 0.2 0.6 B1 830221 822 50.78 34-20.36 81-20.09 2.12 -0.86 6 274 3.7 0. 01 0.1 0.2 01 830221 1041 15.64 34-20.27 81-19.75 1.98 0.12 8 128 3.2 3.07 0.3 0.9 81 830221 1043 46.28 34-20.39 81-19.94 1.30 -0.11 8 131 3.5 0.06 0.3 2.; B1 830221 1059 39.89 34-19.52 81- 19.74 3.45 -0.60 E 207 3.2 3.03 0.1 0.1 C1 830221 1219 5.61 34-20.32 81-19.91 3.39 0.87 10 126 1.9 0.04 0.2 0.3 B1 830225 1521 37.28 34-20.85 81-18.97 1.71 0.58 8 133 2.6 3.04 0.2 0.4 B1 830226 11 1 13.86 34-16.88 81-20.66 1.36 -0.86 9 174 7.2 0.05 0.2 3.1 C1

, 830227 1137 34.93 34-20.09 81-20.13 1.78 -0.85 10 131 3.7 3.01 0.0 0.2 B1 j 830227 1250 57.56 34-20.45 81-18.56 1.11 -1.22 8 245 1.6 0.07 0.9 0.8 01 830227 2041 16.26 34-20.33 81-19.10 3.50 -0.60 8 136 2.2 3.08 3.4 0.7 B1 3, 830228 1639 41.33 34-20.26 81-19.16 3.22 0.01 10 126 2.3 0.05 0.2 0.4 B1 4, 830301 6 0 27.97 34-19.92 81-20.19 1.89 -0.60 8 133 9.1 3.08 0.4 3.8 B1 830302 1848 46.85 34-20.30 81-20.21 1.80 -0.86 10 130 3.9 0.06 0.3 1.0 B1 830302 2116 52.29 34-25.17 81-23.85 5.30 0.82 10 231 9.3 3.06 0.4 0.8 c1 l

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830303 2135 1.42 34-20.30 81-20.17 1.81 0.12 9 130 3.8 0.03 0.1 025 81 830311 833 31.35 34-19.85 81-20.00 3.90 0.12 6 152 3.8 3.04 0.3 1. 4 lB1 830311 856 37.74 34-20.31 81-19.95 2.79 0.21 6 130 9.3 0.05 0.3 2.4 B1 830311 1118 33.41 34-20.46 81-19.38 5.98 0.78 8 130 2.7 3.05 0.3 0.4 B1 830312 054 0.09 34-19.92 81-19.69 2.72 -0.60 7 131 3.0 0. 05 0.2 0.5 81 830312 144 32.96 34-20.76 81-18.19 1.71 -0.86 5 243 1.7 3.04 1. 2 - 0.7 C1 830312 437 38.49 34-20.40 81-18.80 1.77 -0.40 6 247 1.9 0.05 1.0 0.6 01 830312 755 32.47 34-20.56 81-19.45 1.96 -0.24 8 131 2.9 0.05 0.2 0.6 81 830312 1153 12.98 34-20.65 81-19.43 1.99 -0.86 6 254 9.2 0.06 1.9 7.2 D1 830312 14 7 36.33 34-20.47 81-20.62 1.77 0.73 7 134 4.5 3.04 0.3 1.8 B1 830313 1416 25.80 34-19.36 81-18.96 0.29 -0.40 7 247 2.1 0.04 0.4 0.5 C1 830313 1417 5.65 34-19.37 81- 19.71 0.43 -0.40 7 253 3.2 3.03 0.3 0.7 C1 830314 1338 3.48 34-20.76 81-19.89 2.67 -0.60 7 136 3. 7 0. 03 0.1 0.4 B1 830315 736 58.86 34-17.44 81-18.25 4.14 -0.86 5 222 4.2 3.03 0.8 0.6 C1 830316 152 33.31 34-17.61 81-19.74 4.74 -0.24 8 158 5.2 0.03 0.2 0.4 B1 830323 2215 12.76 34-18.58 81-16.95 0.38- 0.57 6 127 2.7 3.05 3.5 1.1 B1 830324 44 3.66 34-20.83 81-19.45 1.98 0.82 9 135 3.1 0.05 0.2 0.7 B1 830324 412 0.19 34-20.85 81-19.84 1.75 0.44 9 137 3.7 3.04 0.2 0.7 B1 830324 524 50.23 34-18.93 81-21.33 0.79 -0.86 5 266 5.8 0.07 1.0 2.5 21 830325 1118 33.88 34-20.36 81- 19.37 4.31 -0.86 9 128 2.6 3.03 0.1 0.2 B1 830326 17 3 2.84 34-20.46 81-19.40 2.54 -0.24 9 130 2.7 0.05 0.2 0.5 B1 l 830326 17 3 57.50 34-20.33 81-19.02 3.41 -0.40 7 127 2.1 3.04 0.2 0.3 81

! 830327 610 16.99 34-20.48 81-19.95 2.05 -0.40 8 132 3.4 0.03 0.1 0.3 B1 830327 1616 33.51 34-19.93 81-13.61 5.75 -0.86 4 176 6.5 3.09 C1 830327 1616 59.68 34-20.80 81-19.54 1.97 -0.40 7 135 3.2 0.06 0.3 0.8 B1 830327 1617 14.89 34-19.06 81-20.42 4.48 -1.22 5 146 11.4 3.00 0.3 0.2 C1 >

, 830327 1618 31.61 34-20.87 81-19.39 1.59 -0.86 5 254 3.1 0.01 0.2 0.2 1 44 l 830327 1848 29.66 34-20.33 81-16.82 0.92 -0.40 5 150 1.6 3.09 5.2 15.7 D1 830328 742 17.10 34-21.29 81-19.89 4.44 -0.60 7 144 4.2 3.04 0.2 0.4 B1 830330 1356 56.07 34-17.52 81-20.02 4.50 -0.86 6 161 5.6 0.03 0.2 0.5 B1 l

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l TECHNICAL REPORT 82-4 l

i SEISMIC ACTIVITY NEAR l

THE V.C. SUMMER NUCLEAR STATION For the Period i October - December 1982 w

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by Pradeep Taiwani Principal Investigator Geology Department University of Soutn Carolina Columbia, S.C. 29208 Contract No. N301315

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