ML20065L527
| ML20065L527 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 03/31/1982 |
| From: | Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC |
| To: | |
| Shared Package | |
| ML20065L526 | List: |
| References | |
| 82-1, NUDOCS 8210190444 | |
| Download: ML20065L527 (17) | |
Text
{{#Wiki_filter:_- . . _. ._ . . TECHNICAL REPORT 82-1 SEISMIC ACTIVITY NEAR
- THE V.C. SUMMER NUCLEAR STATION
! For the Period January - March 1982 by Pradeep Taiwani Principal Investigator Geology Department University of South Carolina Columbia, S.C. 29208 Contract No. N301315
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-Technical Report 82-1
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SEISMIC ACTIVITY NEAR THE V. C. SUMMER NUCLEAR STATION For the Period January - March 1982 by Pradeep Talwani-Principal Investigater Geology Department University of South Carolina' Columbia, S.C. 29208 -
, Contract'No. N230n 9 a;, ' .
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1
- INTRODUCTION 1
This report presents a summary op seismic activity near the
, V. C. Summer Nuclear Power Station in South Carolina for a three-r.onth period between January 1 and March' '31, 1982. During this reporting period a total of 76 locatable events were recorded, two of which exceeded magnitude 2.0.
. SEISMIC NETWORK The repor't 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 j I
(JSC) of the South Carolina ~ seismographic network is also used.
- Location of all these stations is shown in Figure 1, and their co-ordinates are. listed in Appendix I.
DATA ANALYSIS r 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 + 2.04 Log D l where D is the signal duration (seconds). ! An estimate of daily energy release is determined using a simpli-
. ' fied magnitude (M L ) energy (E) relation by Gutenberg and Richter,1956. 1 t
i !
" +I*
109
- 10 "L 4 %
~]. J. N! 4 s- m
2
, RESULTS l Seventy-six events recorded during this reporting period (January 1 -
March 31,1982) are listed in Appendix III. Two events ware of magni-tudes greater than or equal to 2.0 (March 2,1982, ML = 2.69; March 31, 1982', Mt = 2.00). Thirteen events were of magnitudes between 1.0 and L2.0, and the remaining events were of magnitudes less than 1.0 Their-depth estimates indicate that 34% of the activity during this period occurred at-depths between 1.0 and 2.0 km and 54% occurred below 2.0 km, the deepest event being 5.31 km. A' cumulative plot of the epicenters of the events located during this reporting. period is shown in Figure 2. A monthly breakup of their locations is shown in Figures 3-5.
-RESERVOIR 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 4 feet per day between the maximum and minimum water level. We
)
- have been monitoring this water vle' el to see if there is any correlation between the daily or seasonal changes in the reservoir level-and the i
local' seismicity. Figure 6 shows the comparison of water level to l 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. Histogram showing events per day;and log of energy release, includes also the unlocated events around the reservoir. A i _ .m.....-.g =- 1
f' y, ~ CONCLUDING REfMRKS~ ; Relative to the two' previous reporting periods (July - September, 1981 and October December,1981), seismic activity during this three-month period has significantly increased. Figure 7 shows a plot ,
- of the number of events per month from December,1977 through March, 1982, which suggests that seismicity at Monticello Reservoir occurs in discreet swarms, separated by relatively quiet periods. The low level of activity during the previous two reporting periods is associated with the quiet period preceding the swarm occurring in February and March i of this period. However, as is shown in Figure 7, the general level of seismic activity at Monticello appears to be progressively decreasing.
REFERENCES Gutenberg,- B. and Richter, C. F. (1956). Magnitude and energy of I earthquakes, Ann. Geof. 9, p. 1-15. Lee, W. H. K. and -Lahr, J. C. (1972). A computer program for detemining I hypocenter, maanitude and first motion pattern of local earthquakes, Revisions of HYP0 71, U.S.G.S. Open-file report,100 pp. 1 s
~
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4 MONTICELLO RESERVOIR A y JIM
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3 STUDY AREA - JSC 3 - k .\ SOUTH CAROLIN A 4
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[ 5 , e A i ! MONTICELLO EARTHQUAKES JANURRY THROUGH MARCH 1982 17.0 35.0 81 *
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MONTICELLO EARTHOUAKES JANUARY 1982 22.0 21 0 20.0 19.D 15.0 3F.0 15.0 81" t I f f f I f I f I I I I f
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EVENTS / DAY LOG ENERGY RATE CHANGE / CAT (Fil HATER LEVEL (FTl g.co 12.50 25.00 g0.00 12.00 1500 ts.co g.co s.00 10.00 g415.00 423.00 425.03 8 2 8 . 8 - 8 h , CT p- P' P'
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'(- 4 i b APPENDICE: 6 e 4 g,.
v z s, APPENDIX I STATION LOCATIO!! id. STN. LAT. N. LONG. W. 1 001 34 19.91' 81 17.74' 2 002 340 11.58' 81013.81' 3 003 34 21.09' 81 27.41' 4 004 340 25.72' 81 12.99' 5 JSC 34 16.80' 81015.60' e e _
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 8.10 30.00 l l E
le M1 1 1 l 111 1 1 11 1 111 1 111 1 1 11 11: 1 1 1 11 1 1 11 QBDuaB3BCCUCC3CCCBBCBBSCCBBCCCCC3CCC Z1 4227540790152208539354525744003910 R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E051 10000000020001 0001 0201 01 1 e201 1 1 0 2 1 l l 5244421 06301 o150228442415444530o240 R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E01 0000001 000000000000000001 00000000 S688895287651822043287361 97739407250 d00000000000000000000000000000000000 R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 00000000000000000000000000000000000 N031 I 233236909866641 77513557680559752 d593322241 1 1 221 1 42202454 4401 465555S6 E P51 807291 7821 9542d9905667545487S0578 A42232326421 222462233453332333334333 G1 31 11 11 221 221 1221 1 21 1 1 1 1 1 1 1 11 1 1 11 1 2 - Ou76866745746 o5547757o6 o577o58656554 N Gb0381 7292e03711 1261 71 501 442571 o1 046 2 8 Ab576b3021 o47801 27705294024873181 626 M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - S9 E1 01 00001 000001 0001 00000000001 0000000
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4047 850d359628d1 9509 I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I TE L001 1 201 1 201 31 2231 01 1241 431 231 1 33041 a D 4 X Al i I
. D IG N U 3 a1 43443u0497094990t6774 b43279719t7 E CG 9678281 5808 o570720041 25b o878S2263e7 P Ld
_ P A L1 C c1 1 W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G 4 09999790897798 o09989090007601 1 1 1 1 1 21 11 1 1 11 41 1 1 1 2122211 42222221 1 1 11 17 h - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - I! C1 11 1 1 1 1 11 l 1 11 l l 11 l1 1 1 1 1 1 1 1 1 1 1 1 l 111 1 Th L680 c68888 e886b886E866888868888u6886 - hA 0u Mh 0351 1 41 11 u6 01 9 4d358b54931 445791 1934 A 492001 800d34095597682468051 45020352 J N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T1 970001 900991 099999991 79 909000000003 22221 221 1 2211 1 1 1 1 1 21 1 1 21 222222222 A - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - L444444444 *444 444444 444444 4444444444 433333333 a333 JJ3333333333333333333J 75G 273 063C oC7 4d63C438J72 41 1 1 5 c047C5404 71 3927209 N 4. 6. 9. .4 .4 d. 1 . . . . o.844 0641. .81
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