ML20078C157

Seismic Activity Near Virgil C Summer Nuclear Station Oct-Dec 1982

ML20078C157
Person / Time
Site:	Summer
Issue date:	12/31/1982
From:	Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
To:
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ML20078C128	List: ML20078C125 ML20078C138 ML20078C152 ML20078C157
References
82-4, NUDOCS 8309270447
Download: ML20078C157 (30)

Text

r-Technical Report 82-4 De SEISMIC ACTIVITY NEAR THE V. C. SUMMER NUCLEAR STATION For the Period October - December 1982 Sumary #or the Year 1982 and Review for the Period 1977-1982 i

i l by Pradeep Talwant

! Principal Investigator Geology Department University of South Carolina j Columbia, S.C. 29208 i .

Contract No. N230519 8309270447 030920 PDR ADOCK 05000395 R PDR l

1 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 October 1 and December 31, 1982. During this period a total of 22 locatable events were recorded. The largest magnitude recorded was ML = 1.93 on November 16, 1982.

A brief summary of the seismic activity for the entire year of 1982, l

l as well as an update for the period from 1977-1982, is given at the end of this report.

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 coor-dinates are listed in Appendix I.

DATA ANALYSIS Location of the events is determined 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:

ML = -1.83 + 2.T n where D is the signal duration (seconds).

An estimate of daily energy release is determined using a . '

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

log 10E = 11.8 + 1.5 M L

2

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3 RESULTS The 22 located events recorded during this reporting period are listed in Appendix III. All of the events were small (ML _< 1) except

, the one noted above on November 16, Mt = 1.93. Depth estimates in-dicate that 41% of the activity during this period occurred below 2.0 km depth, the deepest event being 6.65 km deep. However, our past experience in relocating these events with magnetic tape data suggests that these depth estimates may be higher than the true depths.

A cumulative plot of the epicenters located during this reporting period is shown in Figure 2 and a monthly breakup of their locations is shown in Figures 3-5.

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 p!'mped back into the reservoir. There can be variations up to about 5 feet per day between the maximum and minimum water level.

We have been monitoring this water level to see if there is any cor-relation between the daily or seasonal changes in the reservoir level and the local seismicity. Figure 6 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 also the unlocated events around the reservoir.

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SUMMARY

OF THE 1982 SEISMIC ACTIVITY A histogram of seismic activity for the year 1982 is presentad in Figure 7, showing the total number of events per day. A total of 271 locatable events were recorded during the year. Their epicentral locations are shown in Figure 8, and cross sections are shown in Figure 9. No depth correlation is noted. The 8 events with magnitudes greater than 2.0 are listed in Table 1, and the 38 events with magnitudes between 1.0 and 2.0 are listed in Table 2. The remaining 225 events were small (ML < 1.0) .

Most of the seismic activity for the year occurred during a swarm from February through April. This can be seen in Figure 10 by two epicentral location maps: (a) the year excluding February through April, and (b) February through April. Earthquakes occurring during February -

April account for 56% of the total activity for the whole year of 1982,

. including all eight events with magnitudes greater than 2.0 and 71% of the events with magnitudes between 1.0 and 2.0.

Two swarms occurred outside the Monticello Reservoir area during the year, one near Blair, S.C. in May, the other near Newberry, S.C. in July and August. The major portion of the activity for the year was concentrated in a broad east-west band located in the center and the western side of the lake.

1977-1982

SUMMARY

OF SEISMICITY i

The level of seismicity increased rapidly from a pre-impoundment average (1973-1977) of 1 event per week to 81 events per week in 1978, and since then the pattern has been characterized by one or more discrete swarms every year (Figure 11). A cumulative plot of epicenters is shown in Figure 12, and the variation in epicentral locations can be seen in

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14 TABLE 2 1.0 ;5Mt ;5 2 0 Date Magnitude Date Magnitude January 21 1.50 April 3 1.06 February 10 1.02 April 3 1.46 February 12 1.87 April 3 1.02 February 16 1.72 April 4 1.21 February 24 1.75 April 5 1.65 March 5 1.18 April 6 1.34 March 7 1.32 April 6 1.64 March 10 1.32 April 16 1.02 March 14 1.18 April 18 1.12 March 23 1.37 May:16 1.21 March 28 1.60 May 16 1.54 March 30 1.42 May 22 1.32 March 30 1.64 May 27 1.44 April 1 1.37 July 29 1.42 April 1 1.09 July 29 1.12 April 2 1.48 July 30 1.15 April 3 1.18 August 27 1.32 April 3 1.09 September 18 1.44 April 3 1.78 November 16 1.93 W

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18 Figure 13. Figure 13a shows the seismicity in 1978 occurring in three clusters, to the north, middle, and southern edge of the reservoir. ,

Variations in epicentral locations are demonstrated by~ envelopes drawn

. around the 1978 activity which were then reproduced on the 1979 map ofearthquakelocations(Figure 13b). An envelope of 1978 and 1979 activity was copied onto a map of 1980 earthquakes (Figure 13c) and so (Figs.13dand13e) forthAs Comparison of these figures indicates most of the activity con-tinues to occur in the same epicentral area and a gradual filling in of the area between the central and southern bands.

Depth variations using only quality B or better events are shown in Figure 14. In Figure 14a, depth ranges were divided into 0.5 km increments up to 3.0, and events occurring deeper were grouped in the 3.0 to 3.5 km category. Figure 14b shows the percentage change with respect to 1978, and the percentage change in each depth increment for the five-year period is shown in Figure 14c. In 1978, over 40% of

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the activity was within the top 1.0 km. The largest fraction of events occurred in the 1.5 to 2.0 km range for the entire period, but the

percentage increased from 1978 to 1980 and decreased in 1981 and 1982.

An apparent deepening of activity occurred in 1981 and 1982 as shown in Figures 14b and 14c.

CONCLUSIONS Seismic activity during the October through December 1982 reporting 1

period was low as in the previous three-month period. A plot of the total number of events per month from December 1977 through December 1982 (Figure 11) suggests a continuous trend at Monticello Reservoir of 3

19 MONTICELLO EARTHOUAKES 1978

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23 discrete swarms of seismicity separated by relatively quiet periods.

However, the overall trend shows a decrease from peak levels in 1978 and 1979, to lower levels in 1980-82. The apparent deepening of seismicity bears careful monitoring; however, our past experience in relocating'these events with magnetic tape data suggests that these depth estimates may be higher than true depths.

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 determinina hypocenter, magnitude and first motion pattern of local earth ;uakes, Revisions of HYP0 71, U.S.G.S. Open File Report, 100 pp.

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APPENDICES I

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A-2 APPENDIX I STATION LOCATION fi ) .j;_ STN. LAT. N. LONG. W.

1 001 340 19.91' 81017.74' 2 002 340 11.58' 81013.81' 3 003 34 21.09' 81027.41' 4 004 34 25.72' 810 12.99' 5 JSC 340 16.80' 81015.60' 6 008 34 24.53' 81 24.55' I

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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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MONTICELLO EARTHQUAKES OC iullE u - DECErbEP 1982 DATE nHTGIN LAT N LONG W DEPTH HAG NO GAP D'tI rj RiiS ERH E97 QM 821011 821014 899 27.16 34-18.96 81-21.57 1 24 8 179 5.8 0.01 0.5 1.9 61 821015 432 19.00 T4-20.32 81-20.05 2 61 82 -00 51 9 130 3.6 0.07 0.3 1.3 B1 848 58.56 34-20.81 Mi-20.25 2.15 -0.60 8 138 4.2 0.02 0.1 0.2 B1 821015 85n 17 81-20.67 1.77 -0.86 9 132 4.5 0.06 0.3 1.2 B1 821017 319 42.62 13 34-20.25 34-18.50 61-17.53 1.85 -0.60 9 132 2.6 0.05 0.3 0.5 B1 821020 540 51.46 34-20.09 81-17.84 2.27 -0 40 7 237 0.4 0.05 0.6 0.4 C1 821107 37 52.22 34-19.32 81-16.89 0.33 0 37 9 130 1.7 0.05 0.2 0.6 B1 821116 1545 51.61 34-20.17 81-20.55 6.65 1.93 11 132 4.3 0.09 0.4 0.6 H1 821116 1934 46.75 34-19.72 31-20.27 1.15 0.87 10 136 3.9 0.07 0.3 2.2 C1 821118 1150 4.11 34-20.11 81-17.46 2.27 -0.40 10 122 0.6 0.09 0.4 u.4 61 821124 815 0.23 34-20.01 81-17 2.77 -0 86 10 119 0.2 0.06 0.3. 0.3 HI 821124 9%0 56.97 34-20.01 R1-19 8409 4.24 0 29 12 126 2.1 0.09 0.4 0.5 B1 821124 1022 4.32 34-20.09 81-19.17 1.74 0.44 10 126 2.2 0.06 0.2 G.5 B1 821126 616 8.79 34-20.01 81-19.46 0.88 -0.60 8 175 2.6 0.07 1.1 7.0 C1 821126 914 08 81-20.72 1.84 -0 11 8 193 4.8 0.03 0.4 i.0 C1 821127 1340 52 to. 52 34-20.69 34-19.58 81-20.80 1,81 0 51 6 163 7 0.04 0.8 2.5 C1 821127 1450 52.97 34-19.65 81-20.65 3.25 0.57 8 160 a.5 0.02 4 0.1 3 B1 821202 13 6 0.61 3a.19.4B 81-1M.46 0.33 0.12 7 242 1.4 0.04 0.5 05C1 0

821219 1120 7.61 34-20.01 81-19.36 1.P2 -0.60 7 128 2.5 0.04 0.2 0.5 61 821221 1643 17.15 34-16.37 821223 Q 11 14.20 34-19.03 81-14.45 0.30 0.95 5 26o 1 0.02 0.6 0.8 C1 821229 155 44.55 34-20.33 81-16.30 01-17.91 1.31 2.67

-0.24 6 6

142 122 29 7 0.06 0.6 1.8 81

-0.40 0.8 0.09 0.6 0.7 B1

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