ML20079E772
| ML20079E772 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 10/01/1991 |
| From: | Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC |
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| References | |
| 91-2, NUDOCS 9110070291 | |
| Download: ML20079E772 (20) | |
Text
- _ _ _ - _ _ . _ _ _ .
TECliNICAL REPORT 91-2 SEISMIC ACTIVITY NEAR THE V.C. SUMMER NUCLEAR STATION FOR THE PERIOD APRIL-JUNE 1991 BY PRADEEP TALWANI Principal lnvestigator DEPARTMENT OF GEOLOGICAL SCIENCES UNIVERSITY OF SOUTH CAROLINA COLUMBIA, S.C.29208 l
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i TECHNICAL REPORT 91-2 :
SEISMIC ACTIVITY NEAR THE l V.C. SUMMER NUCLEAR STATION FOR THE PERIOD--
APRIL JUNE 1991 1 BY-PRADEEP TALWANI Principal Investigator !
Kusata Rajendran ;
and Preetha Sudhakar ,
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DEPARTMENT OF GEOLOGICAL-SCIENCES UNIVERSITY OF SOUTH CAROLINA l COLUMBIA, S.C.29208 CONTRACT NO, N574984
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INTRODUCTION Analysis of the seismic activity near the V.C. Summer Nuclear Station in
.', South Carolina between April 1 and June 30, 1991 is presented in tMs report. During this period, 38 events were recorded in the vicinity of Monticello Reservoir. 31 of which were located. The largest shock was of magnitude Mt=2.0 which occurred on April 29 (18:41:07.72 UTC). ;
SEISMIC: NETWORK Earthquakes during this_ period were recorded on stations of Monticello :
Reservoir and _ South Carolina Seismic Networks. The configuration of -
stations utilized to locate Monticello events is shown in Figure 1 and i station coordinates are listed in Appendix l The operational status of the network-is given in Appendix ll.
DATA ANALYSIS l Hypocentral locations have been determined using the computer program HYPO 71( Lee and Lahr,1972). The. velocity model used in the earthquake locations is given in Appendix lil. The format of the output is given in Appendix IV. The event magnitude was determined from the n.gnal duration at JSC using '
.the following relation:
Mt - 1.83 + 2.04 Log D ,
where D _is the signal duration (seconds).
- An estimate- of daily energy release was determined using a simplified i magnitude (My. energy (E) relation by Gutenberg and Richter (1956):
Log io E = 11.8 + 1.5 M t.
OBSERVED SEISMICITY DURING . APRIL-JUNE 1991- +
During this period 38 earthquakes were recorded, of which 31 were located
- (Figure 2a). Most of the events occurred during April. May (Figures 2b. 2c) and -
.U-were located in the central part of the -reservoir. During June the activity was of low level =(Figure 2d).
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MONTICELLO RESERVOIR J'
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l Figure 1. Location of Monticello Reservoir area showing seismic stations used in locating seismicity.
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MON ~l1 CELL 0 EARIHOUAKES APRll - JUNE 1991 ,
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O KILOMETERS 5 L__1___J 1_ _.L ..J t 0 i r a e o i 5 a > t te MAGNITUDE DLP1H (KMi Figuro 2a. Earthquakes located near Monticello Reservoir during April - June, 1991.
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, j MONTICELLO EARTHOUAKES APRIL 1991 22.0 Pt.o 20.0 OI 19.o is.o it.o t6.o !
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-1 0 l' P J e 0 7 3 4 5 6 96 MAGNITUDE DEPTH (KMT Figure 2b. Earthquakes located near Monticello Reservoir during April 1991.
4
=
MONT1 CELL.0 EARIHOUAKES MAY -
1991 ,
??.0 ?l.0 PD.0 19.0 10 0 17.0 16.0 i i i _ _ t_ a __1_ i _ .. 1. 1__.1_1. _J,_J._, ;
.. .24.0
_ . 23.5
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O klLOMETERS 5 1 1 i i 1 1
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44 0 1 _# 3 4 0 8 # 3 4 $ 6 l' MAGNITUDE DEPfH (KM)
L Figure 2c. : Earthquakes located noar Monticello Reservoir during May 1991.
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i MONI1 CELLO EARTHOUAKES JUNE 1991 .
??.0 21.0 70.0 f .s . 0 18.0 11.0 16.0 L_1_.L L 1 1 1 1LJ: 1 - . J 1.---- ,
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i i 1_J tJ t- e 0 U [I] [] O O 4*. + X 0 0- 1 7 J 4 0 t 3 3 4 5 6 MAGNITUDC DLP1H (KN Figure 2d. Earthquakes located near Monticello Reservoir during June 1991.
6
Most of the located events were of poor quality. Only six ovents woro of B quality and the rest woro of C and D quality. Most of the unlocated events woro of low magnitude (Mts 0.6 ) with the exception of one event on May OG ( Mt -1.2; 18:52:24.80 ) which was recorded at stations JSC and 007 (Appendix VI).
The largest ovent of this quarter was of magnitudo Mt - 2.0 which occurred on April 29 (18:41:07.72 UTC) . There woro six other events of ma0nitude 21.0; 21 ovents of maOnitude 2 0.0 and the rest of the events wore of magnitudo < 0.0.
The long term declino in seismicity observed at Monticello is continuing (
Figuro 3). However, the observed seismicity durin0 this quarter was relatively higher ( larger number of events) compared to the previous quartor (Figuro 3).
The seismicity during this quartor occurred primarily in one sequence during April 29 May 03. Most of the ovents during this swarm occurred in the contor of the lake (Figuros 2 b and 2c). The largest event during this quarter was a part of this sequenco (April 29, ML -2.0). This event was followed by soveral aftershocks, five of which were of magnitude 21.0.
CORRELATION OF WATER LEVEL WITH SEISMICITY Monticello Reservoir is a pumped storage facility. Any decrease in the reservoir levol associated with power generation is recovered when water is pumped back into the reservoir. There can be normal variations up to five foot por day betwoon maximum and minimum water levels. The water level has been monitored to soo if there is any corrolation betwoon the daily or seasonal changos in the rosorvoir lovel and the local seismicity. Water levels are compared with seismicity in Figure 4. The top panol shows the average water levol; the error bars show the maximum and minimum water levels each day.
The second panol shows the chango in water level from day to day. The number of ovents por day and the 100 of energy released are shown in the lower histograms. Thoso charts include a;l reported earthquakes listed in Appendix V and VI. The average water level, daily changes in water lovel, number of earthquakos and energy release are given in Appendix Vll. tw, systematic correlation was observed between the seismicity and reservoir level fluctuations.
CONCLUSIONS The level of seismicity during the second quarter was higher, compared to the 7
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91 106 121 130 151 100 181 go. 1991: JdUAN DATE B-6-
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91 106 121 136 151 106 181 APRL MAY JUNE 1991: JUUAN DATE Figure 4. Comparison of daily lake level, variation in lake level, number of earthquakes and log of energy release (ergs per day) at Monicello Reservoir. Error bars in the top panel indicate daily fluctuations in lake level.
l 9
I previous quarter. The largest event was of magnitude ML- 2.0 which occurred on April 29 (1'3:41:07.72 UTC). There woro six other events of magnitude 21.0.
The seismicity during this quarter was primarily confined to the contral part of the reservoir as in the previous quarter ( Taiwani at al.,1991 ). No systematic correlation was observed betwoon the reservoir lovel fluctuations and the seismicity.
REFERENCES Gutenborg, B. and Richter,C.F. (1950). Magnitude and onor0y of earthquakes, Ann. Geof. 9,1-15.
[
Lee, W.H.K. and Lahr, J.C. (1972). A computer program for determining hypocenter, magnitudo and first motion pattern of local earthquakos, rovisions of HYPO 71, U.S. Geological Survey, Open File Report,100 pp.
Talwani,- P., Rajendran, K and Sudhakar, P. (1991). Soismic Activity Near the V.C. Summer Nuclear Station, Technical Report 91-1.
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APPENDIX l STATION LOCATIONS STATION I, AT' N LONG 'W JSC 34'16.80' 81'15.60' 001 34'19.91' 81'17.74' 002 34*11.58' 81*13.81' 005 34 16.05" 81'20.05' 007 34'22.23' 81'19.50' ,
010 34'20.18' 81'20.25' 09A 34'17.24' 81'19.75' l
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.4 APPENDlX 11 SEISMIC STATION OPERATIONAL STATUS APRIL 01 JUNE 30,1991 STATION PERCENT DOWNTIME
.JSC 6 001 7 002 8 005 12 007 6 010 8 09A 'OO i
12_ _
i: _ _
APPENDIX 111 MONTICELLO RESERVOIR VELOCITY MODEL Velocity Depth to top km/sec km 1.00 0.00 5.40 0.03 5.90 0.18 6.10 0.46 6.30 0.82 8.10 30.00 13 ,
. _ . . _ . _ _ _ . _ . _ . _ _ _ _ . _ ~ . . - -_- .- --
APPENDIX IV :
MONTICELLO EARTHQUAKES -
HYPO 71 FORMAT ;
- l. . Column 1 Date l Column 2 Origin time (UTC) h.m.sec.
Column- 3. Latitude (N) degrees, min. !
Column 4 Longitude (W) degrees, min. ,
Column 5' Depth (km).
Column- 6 Local duration magnitude.
Column 7 No. of station readings used to locate event. P and S arrivals from same stations are regarded as 2-readings.
Column 8 Largest azimuthal separation in degrees between stations. 1 Column 9 Epicentral distance in km to nearest station.
- Column - 10. Root mean square error of time residuals in sec.
RMS - RF/No, where. Riis the time residual for the ith j station.-
Column 11 Standard. error of the epicenter in km'. -
Column 12 Standard error of.the focal depth in km*.
- Column 13 - Quality of the epicentral location.
Statistical interpretation of standard errors involves assumptions which !
., may not be met in earthquake locations. Therefore standard errors may not 1
- represent actual error = limits. . ;
. Note:- If ERH or ERZ'is blank, this means that it cannot be computed, because of 3 insufficient data.
14
APPENDIX V MONTICELLO EARTHOUAKES APRIL-JUNE 1991 BATE ORIGIN LAT N LONG W DEPTH MAG NO GAP DMIN RMS [RH ER2 QW 0425 1416 41.31 34-19.53 81-20.17 0.23 0.21 5 244 1.2 0.06 0.1 0.1 C1 429 1113 54.77 34-21.15 81-16.53 0.69 1, 72 4 233 5.0 0.21 C1 429 1251 50.15 34-19.70 81-17.57 1.93 0.82 7 183 4.2 0.07 0.5 2.2 C1 0.23 0.44 8 171 3.7 0.10 0.7 2. 7 C1 429 14 3 31.91 34-19.58 81-17.95 1.00 0.21 5 172 0.2 0.16 0.6 0.7 C1
'60429 1423 42.66 34-16.90 81-15.70 0.55 0.82 6 154 3.0 0.09 1.2 6.2 C1 910429 16 3 13.10 34-19.22 81-18.70 0.57 9 153 3.3 0.12 0.8 S.O C1 910429 1614 51.45 34-19.26 81-18.42 1.11 910429 1841 7.72 34-19,78 81-19.16 0.96 2.00 5 142 1.8 0.05 1.2 4.b C1 910429 2012 19.31 34-19.49 81-18.64 0.81 0.82 7 151 2.8 0.10 1.1 2.1 C1 910429 2025 56.74 34-23.96 81-19.00 6.84 1.02 5 32/ 3201616.014101 910430 332 0.77 34-19.48 81-18.25 0 85 0.21 6 161 3.3 0.10 2.0 39.7 C1 910501 44 6.91 34-20.00 81-17.58 2.88 -0.24 6 188 4.1 0.10 1.7 0. 7 C1 910501 13 5 55.63 34-19.53 81-18.66 0.63 -0.40 6 152 2.7 0.14 3.8 18.0 C1 910502 1035 18.94 34-19.88 81-19 51 2.94 1.18 10 110 1.3 0.10 0.6 0.7 81 910502 1040 31.25 34-19.82 81-18.53 0.92 0.12 8 160 2.7 0.09 0.0 4.6 C1 910502 1222 55.71 34-20.01 81-18.86 2.60 1.02 12 110 1.7 0.09 0.5 0.6 01 910502 1321 58.12 34-19.96 81-18,70 0.73 -0.60 7 157 2.4 0.12 1.5 3.2 C1 910502 1750 58,13 34-19.98 81-18.59 0.02 0.82 4 161 2.0 0,03 C1 910502 2339 52,38 34-20,31 81-18.26 2.84 1.54 11 161 1.1 0.19 1.3 1. 7 C1 910502 2351 19,12 34-20.28 81-19 D9 3.80 0.21 12 118 1.8 0,13 00 0.8 B1 910502 2351 35.81 34-20.28 81-17.84 1.00 -0.40 8 187 0 7 0.13 1.0 1.3 C1 910503 03 5.87 34-20.01 81-18.84 3.27 0.82 11 110 1.7 0.10 0.6 0.7 B1 910503 110 38.96 34-19.92 81-18.60 2.22 0.82 12 108 1.3 0.08 0.4 0.6 01 910519 58 2.82 34-19.66 81-18.15 0.87 0.12 6 165 3.4 0.07 0.6 9.0 C1 910519 511 8.19 34-19.08 81-19.05 1.93 0.2) 7 168 2.7 0.07 0.9 1.4 81 910523 1546 16.35 34-22.33 81-15.07 1.85 0.68 5 206 6.8 0.11 4. 7 15.9 D1 910526 23 3 46.00 34-20.50 81-10.81 0.28 -0.24 6 139 0.9 0.05 1.0 2.S C1 910527 419 28,32 34-20.28 81-20 36 1.D' O.N2 12 203 0 2 0.16 1.0 0 H C1 910612 2332 26.38 34-19.35 81-19.32 1.52 -0.11 G 188 2.1 0.12 42 4.4 01 910618 17 6 12.33 34-20.61 81-16.33 1.83 0.01 6 229 2.5 0.13 3.0 3.7 D1 910620 1919 23.33 34-20.99 81-20.90 3.35 0.37 9 231 1.8 0.11 1.0 0.8 C1 15
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APPENDIX VI :
LIST OF EVENTS WITH S.P s 2.5 SEC RECORDED AROUND ,
MONTICELLO RESERVOIR DURING 1 APRIL 1991 30 JUNE 1991 DATE . STATION P. ARRIVAL TIME S.P - EP.DIST DUR MAG H MIN SEC SEC s.p.8.5 k m SEC l
91 04 24 JSC- 18 25 35.10 1.9 16.2 15.0 0.6 91 04 29 007 11 25 39.30 5.0 0.4 JSC 39.80 0.6 05.1 - -
91 04 30 - - JSC- 01 54 28.00' *
- 10.0 0.2 l 91 04 30 JSC 19 02 26.80
- 3.0 -0.9-91 05 02 JSC 22 00 47.90 0.5 04.7 5.0 0.4 91-05 06 007 18 52 24.80 1.2 10.2 30.0 1.2 JSC 26.50 1.5 12.8 . .
- 91 05 25 JSC 21 55 36.10 0.6 05.1 3.0 0.9 ,
- Event is very close to the station; (S.P) not clear. l n
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APPENDIX Vil Maximum and minimum water levels (ft), change in water level, number of' earthquakes and log energy release (orgs por day) at Monticello Reservoir during April 1 - June 30, 1991.
A B C D E l F l G _
1 DATE WL(max)_,.WL{ min)_ Wl{avgj CHANGEjtAEqs EtiERGY_
2 91 425 423.8 424.6 0 0 0 3 92 424.2 423.8 424.2 -0.4 0 0
. 4 93 424.6 424 424.4 0.2 0 0 5 94 424.2 424 424.2 0.2 0 0 6 95' 424.3 424 424.1 0.1 0 0 7 ~
- 90 424.5 424 424.2 0.1 0 0 8 97 424.5 424.1 424.2 0 0 0 9 98 424.9 424.3 424.b 0.3 0 0 10 99 425 424.2 424.7 02 0,. 0 11 100 424.4 423.8 424.2 -0.5 0 0 12 101 424.9 424 424.5 0.3 0 0 13 102 425 424.1 424.8 0.3 0 0 14 103 424.6 424.1 424.4 0.4 0 0 15 10 4,,, 424_.9 424.2 424.5 0.1 0 0 16 105 424.9 423.9 424.3 0.2 0 0 17 106 __
425 423.7 424.2 3.1 0, 0 18 107 424.9 423 424.1 -0.1 0 0 19 108 424.G _ 423.1 424.2 0.1 0 0 20 10,9, .
, 435 424.3 424.7 0.5 0 0 21 110 424.3 424.3 424.3 0.4 0 0 22 111 424.3 423_6 ,,
424 -0.3 0 0 23 112 424.3 423.8 424.1 0.1 _0 0 24 113 421.9 424 424.4 0.3 0 0 25 114 424.2 423 423.8 -0.6 1 12.0 26 115 421.2 423.1 423.7 -0.1 1 12.1 27 116 124.5 423.2 423.8 0.1 0 0 28 117 42b 4236 424.5 0.7 0 0 29 lit) 424.2 423.9 424.1 -0.4 0 0 30 119 424.9 422.8 424 -0.1 10 15 21 1,20 425 ___4J2.7 424 0 3 12.3 32 121 424.9 422.2 423.8 0.2 2 11.6 33 122 424.7 422.5 423.7 -0.1 9 14.3 34 123 4j 4.8_ 422.7 423.9 0.2 2 13.3 35 .
124 42_1,8 423.1{ 424.4 0.5 0 0 36 125 42;3 424.3 -0.1 0 0 424L 37 12S 424 9 424.3] 424.5 0.2 1 13.5 38 127 424 6 424 3} ~ ~ ~424.5 0 0 0 39 ~728 4R4 4243 424.4 -0.1 0 0 40 12_9_ 424.3 4 2'2T8' 423.8 -0.6 0' O
, 41 130 424.8 421.6 423.5 -0.3 0 0 42 131 424.1 422 423.6 0.1 0 0 43 ,
132 4?44 423 9 424.3 0.7 0 0 44 133 424 9 422.9 424.2 0.1 0 0 45 134 425 421.5 423.4 0.8 _ .,
0 0 46 135 425 _
421.31 423.4 0 .
0 0
_47 136 425g_ __ 421.9_ 424 0.6 0 0 48 137 _ 425! 421.9 423.6 -0.4 0 0 l
17
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.. A B C D E F G 49 138 424.9 422.2 423.4 -0.2 0 0
.. 50 139 _,,,_ ,425 422.4 424.3 0.9
- 2 .
12._3 51 140 425 423.8 424.5 0.2 0 0 E
141 424.3 423.8 424.1 0.4 0 0 53 142 424.1 l 423.9 424 0.1 0 0 '
54 143 423.9 423.1 423a 6 0.4 1 12.8 55 144 424.1 423.4 423.8 0.2 0
{
0 56 145 424.3 423.0 0.2 42_4 1 10.5 57 140 425 423.1 424.2 0.2 1 11 )
58
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147 423.4 422.8 423.1 1.1 1 13 59 148 425 421.9 423.9 0.0 0. O i 60 149 424.9 422.1 423 0 0.3 0 0 61 150 425 421.9 423_0 0 0._ 0 62 151 425 421.5 423.5 0.1 0 0 63 152 424.9 422.1 423.4 0.1 0 0.
64 153 424.;8 422.7 424 0.6 0 0 65 154 425 422.4 423.9 0.1 0 0 '
66 155 425 422 4 423 0 0 0 0 67 15G 422 9 424.1 0.2 425_ 0 0 68 157 425 422.7 _4 .23J 0.4 0. 0 69 158 424.1 422 8 423 7 0 0 0 70 100 425 422.7 423 8 01 0 0 71 1001 424.4 422.7 423.6 0.2 0 0 72 101 425 423.1 424.2 0.6 0 _0 73 1G2 425 422.G 424.2 0 0 0 74 103 424 422.0 423 4 08 1 11.6 M 104 423 5 422 423_ -0.4 0 0 76 105 423 9 4,22.2 423 6 0.6 0 0 77 103 424 8 422 4 4230 0 0 0 78 107 424 4 422.4 423.5 -0.1 0 0 79 103 424 9 422.3 423_8 0.3 0 0 80 103 425 4,22,.3 423.7 0.1 1 11.8 81 170 424 9 422.9 424.3 0.6 0 0 82 171 424 1 423.3 423.6 0.7 1 12.3 83 172 425 4228 424 2 0.6 0 0 84 173 424M 422.1 dii 0.8 _ 0 0 85 17: 424 0 4220 423.9 0.5 7
0 0 66 ~ 17; <5 '
42if MU 0.5 0 0 87 170 423 4 C 1 G[ _ 424;1 0.0 0 0
.. 88 177 4'2
' 4220 423 7 0.4 0 0 89 1; 4. 1 422.7 423.7 0
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