ML20078C138

Seismic Activity Near Virgil C Summer Nuclear Station Apr-June 1983

ML20078C138
Person / Time
Site:	Summer
Issue date:	06/30/1983
From:	Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
To:
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ML20078C128	List: ML20078C125 ML20078C138 ML20078C152 ML20078C157
References
83-2, NUDOCS 8309270437
Download: ML20078C138 (24)

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Technical Report 83-2 SEISMIC ACTIVITY NEAR THE V. C. SUMMER NUCLEAR STATION For the Period April - June i 1983 l .

i l

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

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8309270437 830920 PDR ADOCK 05000395 R PDR

1 INTRODUCTION This report presents a sumary of seismic activity near the V. C.

. Sumer Nuclear Power Station in Sout'n Carolina for a three month period from April 1 through June 30, 1983. During this period a total of 181 locatable events were recorded, 64 in the imediate Monticello Reservoir area and 117 in the Newberry, S. C. area approximately 15 miles west.

Three events greater than 2.0 occurred during this period, one in the Monticello Reservoir area and two near Newberry. Twenty-five events had magnitudes between 1.0 and 2.0 and the remaining events were small (ML <l.0).

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 permanent station (JSC) of the South Carolina seismographic network are also used. Location of all these stations is shown in Figure 1, and their coordinates are listed in Appendix I.

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

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

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

An estimate of daily energy release is determined using a simplified magnitude (M L

) energy (E) relation by Gutenberg and Richter, 1956.

log 10E = 11.8 + 1.5 ML

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3 RESULTS The 181 events located during this reporting period are listed in Appendix III. Of the three events larger than magnitude 2.0, one occurred in the Monticello Reservoir area (June ll, ML = 2.2), and two near Newberry, S. C., approximately 15 miles west (April 28, ML = 2.2; May 7, ML=2.45). The 25 events with magnitudes between 1.0 and 2.0 are l listed in Table 1. Depth estimates for the Monticello Reservoir asso-  !

ciated events indicate approximately 61% of the activity was within 2.0 km of the surface, 9% between 2.0 and 3.0 km depth, and 30% at depths greater than 3.0 km. Figure 2 shows the percentage of events occurring in 0.5 km depth increments for the first six months of this year in com-parison with the previous five years based on A and B quality events.

Most of the activity occurs between 1.5 and 2.0 km depth, and the per-centage of events occurring at depths greater than 3.0 km 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 shallower. No depth statistics were carried out on the Newberry area earthquakes.

A cumulative plot of epicenters of events located around Monticello Reservoir during this period is shown in Figure 3, a cross section in Figure 4, a monthly breakdown of epicentral locations in Figures 5-7, and a cumulative plot of Monticello Reservoir and Newberry epicentral locations in Figure 8.

RESERV0IR WATER LEVEL AND ITS COMPARIS0N WITH SEISMICITY Monticello Reservoir is a pumped storage facility. 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

m . _ _

4 TABLE 1

. EVENTS WITH MAGNITUDES BETWEEN 1.0 AND 2.0 Date Time (U.T.C.) Magnitude Location April 3 0954 1.27 Monticello Reservoir (fl. R.)

April 3 1040 1.27 M. R.

April 11 1100 1.15 M. R.

April 21 0403 1.42 M. R.

April 28 0243 1.72 Newberry April 28 0708 1.15 Newberry April 28 0900 1.15 Newberry April 28 1031 1.80 Newberry April 28 1139 1.12 Newberry April 28 2039 1.50 Newberry April 28 2249 1.65 Newberry April 28 2302 1.44 Newberry April 28 2311 1.06 Newberry May 7 0355 1.18 Newberry May 8 0336 1.52 Newberry May 8 1155 1.81 Newberry

. May 9 0425 1.62 Newberry May 9 0426 1.15 Newberry May 9 0655 1.32 Newberry

. May 9 0655 1.46 Newberry May 16 1506 1.09 Newberry May 16 1511 1.18 Newberry June 2 0509 1.32 Newberry June 10 1901 1.78 M. R.

June 25 1602 1.32 M. R.

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12 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 9 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 Seismic activity in the Monticello Reservoir area during the April through June, 1983 reporting period indicates a continuation of the long term trend of swarms and quiet periods established over the past years. Figure 10 is a histogram of the number of events per month from December, 1977 through June, 1983 which suggests discrete swarms separated by relatively quiet periods. The April - June level is consistent with this trend in suggesting the end of a swarm preceding a quiet period. The majority of depths for the three month period con-tinue to be in the 1.5 to 2.0 km range. Seismic activity in the Newberry area should continue to be monitored due to the undetermined cause and the possible impact of increased activity on the Monticello Reservoir area.

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, l Revisions of HYP0 71, U.S.G.S. Open-File Report, 100 pp.

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APPENDIX I STATION LOCATION NO. STN. LAT, N. LONG. W.

1 001 34 19.91' 810 17.74' 2 002 340 11.58' 81 13.81

3 003 340 21.09' 81027.41' 4 004 340 25.72' 81 12.99' 5 JSC -

340 16.80' 81 15.60'

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t TECHNICAL REPORT 83-1 SEISMIC ACTIVITY NEAR THE V.C. SUMMER NUCLEAR STATION For the Period January - March 1983 by Pradeep Taiwani

. Principal Investigator Geology Department University of South Carolina

"' Columbia, S.C. 29208 Contract No. N301315

. .