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Seismic Activity Near VC Summer Nuclear Station for Period Jan-Mar 1985, Technical Rept
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Site:	Summer
Issue date:	03/31/1985
From:	Talwani P; SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
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TECHNICAL REPORT 85-1 SEISMIC ACTIVITY NEAR THE V.C. SUMMER NUCLEAR STATION For the Period January - March 1985 by Pradeep Taiwani Principal Investigator Geology Department University of South Carolina Columbia, S.C. 29208 Contract No. N385310 NDR ADO K 5

95 R

8 PDR 1

_ - - -. - -. _ _ _ _, -. _ _. - - _ _. _ - -,.. - - - ~. - - - - -. - - - -. _ _

TECHNICAL REPORT 85-1 4

SEISMIC ACTIVITY NEAR TEE V.C.

SUNNER NUCLEAR STATION FOR THE PERIOD JANUARY - MARCH 1985 BY PRADEEP TALMANI PRINCIPAL INVESTI0ATOR AND CYNTHIA S.

EVANS RESEARCH ASSISTANT GEOLOGY DEPARTMENT UNIVERSITY OF SOUTH CAROLINA

COLUMBIA, S.C.

29208 CONTRACT NO. N230519 l

-e-ay---

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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 January 1 and March 31, 1985.

During this period, a total of 216 locatable events were recorded.

One of the events had a magnitude equal to 2.0, and nine had magnitudes between 1.0 and 2.0, and the remaining events were small (M

< 1.0).

Most of the events L

(884) were shallow (< 2.0 km), although a well located event was deeper than 7.0 km.

Seismic Network The report is based primarily on data recorded by the four station network operated by S.C.E.

and G.

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 HYP071 program (Lee and Lahr, 1972) and the velocity model listed in Appendix II.

The event magnitude (M g) is determined from signal duration at station JSC, using the following relation:

-1.83 + 2.04 log D Mg=

where D is the signal duration (seconds).

2 19 3

4 MONTICELLO RESERVOIR l'

(47 a

1 a

6A

^JSC STUDY AREA J

SOUTH CAROLIN A 0

5KM Figure 1

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

log

~

10 L

Observed Seismicity for the Period January - March, 1985 The summary listing of HYP071 program for the 216 e

located events recorded between January 1 and March 31, 1985 is given in Appendix III.

During this period the seismicity showed appreciable changes from month to month (Table 1).

Over this three month period there were 10 events with magnitudes >

1.0, and 28 events with depths > 2.0 km.

The seismicity in January was anomalous.

In that month there were 15 (out of the 28) deeper events and 7 (out of the 14) larger events.

The deepest event, located with quality B occurred on January 19, 1985, with a magnitude of 1.0 and had a depth of 7.2 km.

February was characterized by a Inrger number of events, 50 of which occurred in a two-day swarm.

In February, only 3 events had magnitudes greater than 1.0.

Depth analyses for the three month period for all located events indicate that 88 percent of the activity occurred within the uppermost 2 km as shown in Figure 2.

Events deeper than 3.0 are plotted together in the depth range 3.0 to 3.5 km.

The seismic activity for the three month reporting period was located in the central portion of the reservoir area.

A cumulative plot of epicenters of events located

=

4 4

i 4

Table 1 Seisaicity Pattern of Located Events 4

i No. of No. of Events j

Events Events Events with iggg gggggggd Lggalgd 1 2,,,Q hg M

1 1,,,Q t

January 52 46 15 7

February 151 140 7

3 March 35 30 4

0 Total 238 216 26 10 I

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1985 (Jan.-Mar.)

N = 216 Figure 2 l

4 e

6 during this period is shown in Figure 3 and a cross section of events located within 1 km on each side of line AA' and line BB' is shown in Figure 4.

The events in the cross section appear to define a clustering in the upper 2 km with some deeper events.

Cross section 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 is shown in Figures 5-7.

Reservoir Water Level and its Comparison 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 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 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 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 The depth of seismicity for this reporting period was mostly contained within the upper 2 km.

In January a

7 510NTICELLO EARTHOUAKES JANUARY - MARCH 1985 M

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85.001 85.085 85.025 65.016 05.041 05.051 85.061 05.071 85.081 85.094 JULIAN DATE J>=

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.5. 0. i JULIAN DATE Figure 8

13 proportionally larger number of events were deep with the deepest event at 7.2 km, whereas in February and March all of the seismic activity occurred within the upper 3 km.

A histogram of the total number of events per month from December, 1977 through March, 1985 (Figure 9) shows that seismicity has been decreasing for approximately five years.

Seismic activity during the January through March, 1985 reporting period was higher than the recent past with a peak in activity in February.

References Gutenberg, B.

and Richter, C.F.

(1956).

Magnitude and energy of earthquakes, Ann geof.

9, p.

1-15.

t 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 HYP071, UgGg Open-File Report, 100 pp.

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APPENDICES O

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16 APPENDIX I

. STATION LOCATION H92 EIH LeIt E L9E9 M

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' i

5 JSC 34*

16.80' 81*

12.99' 6

06A 34 17.32' 81*

18.15' 7

007 34 22.23' 81* 19.50' l

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17 APPENDIX II MONTICELLO RESERVOIR VELOCITY MODEL Velocity Depth hEd11E h5

-1.00 0.00 5.40 0.03 5.90 0.18 6.10 0.46 6.30 0.82

'8.10

-30.00

't.

D

3 APPENDIX III i

MONTICELLO EARTHQUAKES JANUARY MARCH 1985 j

i DATE UPIGIN LAT N LONG W DEPTH MAG N0 GAP DMIN RMS ERH ERZ GM 850103 1145 11.67 54-23.25 81-19.05 1.07

-0.40 7 171 6.5 0.09 0.4 11.0 C1

)

850103 14 2 51.12 34-20.10 81-19.30 0.04 1.12 8 251 2.4 0.05 0.a 0.7 C1 i

850105 916 36.87 34-19.66 81-18.45 0.81

-0.24 8 12.6

}.2 0.06 02 0.5 B1 3

s.2 0.07 0.

0.6 B1 2

850107 2 58 33.63 34-20.62 81-20.20 0.18

-0.86 9 140 850113 15 9 55.95 34-20.01 81-17.84 0.40 0.01 9 170 0.2 0.07 0.5 0.2 81 i

850113 1519217 35 77 34-19.76 81-18.57 2.00

-0.24 8 189 1.3 0.09 0.6 0.7 C1 25 85011a 65 34-19.69 81-18.04 2.00 0.01 10 178 'O.6 0.06 0.4 0.3 81 02 13 103 0.9 0.07 0.2 0.7 B1 850115 1711 6.38 34-19.60 81-18.23 0.35 1 96 850115 17a8 38.18 34-1o.58 81-18.11 1.00 1

10 100 0.8 0.09 0.5 1.2 B1 1 0.09 0.3 0.6 B1 850115 1610 57.77 3n-19.71 81-1.39 0.04 0.44 13 105 1 7 0.06 0.2 0.5 B1 i

37 12 1 4 850115 1811 10.64 34-19.45 81-1 66 2.26 0 34 13 1 2 1 8 0.08 0.2 1.3 B1 850115 1812 30.30 34-20.01 81-1 89 1.11 1

1.

850115 1914 39.95 34-20.01 81-1 63 0.57

-0 40 12 1 4 1.4 0.09 0.3 0.7 B1 850115 2040850115 23do 32 14 34-19.71 81-1 40 0.23 0.29 13 107 1.2 0.09 02 0.9 81 13 3

03 0.3 81 m

7 98 34-19.83 81-1 84 0.51 0.91 11 144 5 2 0.04.5 0.09 0

J 97 34-20.30 81-1 81 1.88 0.87.

6 23 1.

4.5 C1 i

850116 054 850116 247 0.26 34-1 80 81-18.15 3.63 0.37 5 1 0 4.6 0.02 0.5 0.6 1

46 0

6 25 4.6 0.03 0.5 0.7 1

850116 2a7 35.68 34-1 28 81-19.95 2 97

-0 78 4 9 0 07 1.

40 4 182 70 1

850116 a49 12.12 34-2.

03 81-17.98 J

850116 5 3 47.97 34-2 943281-14*48 1.98

-0 40 4 269 74 0 07 1

^5 850116 656 58.42 34-1 81-18.82 3.95 0 78 6

78 4

02 0.4 0.4 bL 5 46

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8 81-18*48 850116 1126 14.30 34-1 0

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850117 1150 22.18 34-1 *20 81-P.0.18

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06 1.0 28C 0

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34-20 81-1 64 1.93

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44.1234!948 850117 12 6 51.90 49 81-1 60 1.93

-0 4

4 233 850117 1351 34-9.85 81-1 01 4.06 0

3 6 174 4.7 0.02 0.4 0.46' 850118 1057 36.37 1

0.4 0.6 81 1

0 01

.0 126 I

850119 950 7l57 2l2 0l09 81-1 45 34h9*66 7

34 71 1 0 06 0.2 0.3 B1 23 0 95 4 106 34- 0.47 81-1 90

'850119 14 9

.69 33 81-1 25 0.55

-1 2 10 125 0.

0.5 B1 1.1 0l09 850119 1551 12.04 34-20*28 81-1 64 1 00

-0 4 11 115 0 7 0 06 0.

0 3 B1 850120 650 46.70 34-20 4

5 139 5*2 0.04 0.

5 9 01 850120 15u3 26.0A 34-21.10 81-1 41 1.05

-0,11

-0 7 169 0.5 0.04 0.3 0.3 B1 850121 1351 0.30 34-19.69 81-1 60 0.54 i

1 C1 t

850122 643 17 39 34-19.50 81-1 84 0.62

-0 86 5 214 0.8 0.05 2.4 04.2 C1 1957 44 i

850121 66 34-19.69 81-1 84 1.85

-0 40 5 223 0.4 0.01 0.3 850122 2143 42.21 34-2 19 81-1 33 1.51 1 02 12 116 2.5 0.06 0.2 0.6 61 13 34-1 98 81-1.35 4.40 0 73 9 128 2.5 0.08 n.3 0.5 81 j

850122 2250 45 32 34-1 3

21 81-1 02 0.72

-0.40 10 128 4 0.07 0.3 0.5 B1 1 5 0.07 850123 12 2 1.

0.6 1.1 B1 81-1 0.53

-0.60 6 169 8t-16 25 0.28

-0.86 7 140 850123 1458 16.60 34-1 20 o 0.09 0.4 0.8 61

2. 5 0.04 67 i

850124 c52 3a.82 34-1.32 75 6.04

-0.24 5 159 5.

1.1 1.3 C1 i

850125 2257 49.56 34-1 57 81-15 91 6.51 0.01 9 123 4.1 0.08 0.4 0.6 81 81-17.

{

850126 258 14.56 34-1.54 l

i l

. 3 DATF G T Gin!

LAT I4 L OflG W OFPTH

94G fl0 GAP OMirj Rr1S ERH ERZ 0" 850127 1757 5.34 34-20 e4 81-19.19 4.07

-0.40 o 197 2.o 0.06 0.7 0.6 C1 1

9 266 7.8 0.07 2.7 8.9 01 850128 19d0 12.22 34-25.82 81-22.14 0.48

-0 54 40 6 183 4.2 0.08 0.6 2.1' C 1 85u130 1418 51.71 34-20.32 81-18.01 0.79 850130 15 0 16.92 34-20.34 81-18.29 0.95

-0.40 6 176 39 0.09 1.0 12.8 C1 9

0.08 0.2 0.4 B1

-0 24 14 101 850131 0 54 40.10 34-20.01 81-1 33 1.58 1

0 2 0.04 C1 4 224 850201 112 44.98 34-19.2o 81-1 84 1.70

-0 60 1.

60 7 233 0.3 0.05 0.8 0.4 C1 850201 3d5 13.43 34-19.77 81-1 84 1.38 7

34-20.01 81-1. 35 1.31

-0.24 12 102 1.0 c.08 0.33 57 5 B1.2 D1 0

850201 726 850201 2251 45 57 66 34-1 71 81-1 81 0.82

-0.86 6 217 3.2 0.04 03 0.8 B1 850202 50 11.43 34-1 72 81-1 59 0.39 0.01 to 127 1.4 0.08 0

850202 17/6 59.55 34-1 52 81-1 52 1.70

-0.c0 8 128 1.4 0.07 0.4 0.6 B1 850202 1512 10.54 34-20.01 81-1 45 1.61

-0.40 12 104 1*1 0.09 0.3 0.5 81 850202 16t? 51.73 34-20.10 81-1 70 1.83

-0.60 7 201 1.5 0.02 0.2 0.2 C1 850202 1943 13.12 34-20.01 81-18.82 0.63

-0.11 to 192 1.7 0.06 0.3 0.5 C1 850202 2214 46.12 34-19.92 81-18.09 1.59

-0.40 11 122 0.5 0.09 0.4 0.4 B1 45 38 34-1 58 81-1 55 1.54

-0.24 7 205 1.4 0.06 0.4 0.5 C1 850203 411 14 30 34 2.01 81-1 84 0.79

-0.24 9 170 0.2 0.07 0.4 0.2 B1 850203 1717 850203 2059 30.83 34-1 70 81-1 32 1.77

-0.86 6 197 1.0 0.05 0.4 0.4 C1 650204 3d5 23.77 34-1 94 81-1 31 1.88

-0.60 7 192 0.9 0.01 0.1 0 7 81 1 C1

-0 95 12 107 1.2 0.09 0.3 0

1419 21 3d-1 84 81-1 53 0.60 0

S50204 14d8 57 37.52 34-20 92 81-1 26 2.06 7 190 0.8 0.08 0.6 0.6 C1 850204 34-19 81-1 23 1.32

-0 60 8 179 0.7 0.06 0.4 01 0.4 B 21 0.1 C,1 850205 258 4P.03 34-19.84 81-1 2n 1.69

-0 40 850205 258 21.59 40 6 193 0.8 0.01 0

850205 11 7 16.90 34-20 1

81-1 84 1.

0

-0.60 5 237 0.

0.08

.2 1.1 C :

850206 140 10 34-2. 0 81-1 82

1. 8

-0.60 7 179 3*

0.07 0.5 10 0 BL 850206 1310 59 9875 34-1 3

81-1 52 0.

9

-0 6 268 1.

0.02 0.2 3 C1

-0 60 5 307 1.6 0.02 0.4 0.4 C1 850206 1354 14.85 34-1 11 81-1 07 0.57

-0 40 6 183 0.9 0.04 0.3 0.4 C1 85020e 19 9 20.76 34-1 7:

81-1 28 0.o1

-0 60 4 281 3.7 0.09 C1 0 1 81-2.

15 0.32

-0l86 850206 19 9 28.39 34-2 59 81-1 l07 1.00 60 6 180 0.8 0.06 0.5 0.5 B1 850206 1917 24.26 34-1 40 6 179 1.6 0.03 0.2 0.5 81 850207 1310 5.co 34-1 71 81-1 78 0.24

-0 24 9 193 0.2 0.08 0.4 0.3 B1 3 50 81-1 84 1.00

-0 24 850207 14 2 19l75 34-2.01 45 34-1 73 81-1 53 0.89

-0 6 170 3 0.09 0.8

..B B1 850208 19 850208 19 3 46.64 34-

.39 81-1 82 0.16

-0.60 5 289

.9 0.01

.8 C1 1l1 81-59 0.22

-0.86 5 286

. 5 0.04 1 1

. 4 C1 l48 850208 19 4 14 34-18 92 34-55 81-

39 0.09

-0*86 4 192

. 6 0.06 C1 850209 150 16 1

-0 11 10 103 0 0.09 0.4 0.8 81 2 00 850209 314 58.10 34-01 81-41

.,9 0.00 0.1 0

C1

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-0 86 5 272 850209 355 37.43 34-70 81-L8 97 1 8 0.03 11 34-49 81 ' 8 79 1.85

-0 60 5 182 0.8 1.

C1 1 8 0.08 850209 559 5c.66 81-L7 0.35

-0 5 296 1.

0.4 0

C1 24 34-15 81-18 05 1.48

-0 60 850209 e8

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.24 9 101 0.7 0.04 0.2 0.2 81 850209 9 7 22.46 34-83

DATL o,.rG u i Al i.

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.4 DLPen 00G NO GW DMIN Nfy LRh LRZ yr; 850209 1u53 5.no 34-18.85 81-18.92 0.27

-0.60 5 309 2.7 0.00 0.0 0.0 C1 850209 las3 5 75 34-16 o

81-1 92 1.10

-0.86 4 329 7.3 0.01 C1 850204 1846

.B1 34-18 1

81-1 66 0.31

-0.60 4 315 2.6 0.00 C1 1

850209 2110 50.43 34-18 8

81-1 19 1.o9

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