ML19352A862

Seismic Activity Near VC Summer Nuclear Station for Period Jan-Mar 1981.

ML19352A862
Person / Time
Site:	Summer
Issue date:	05/27/1981
From:	Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
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W Technical Report-81-1 SEISMIC ACTIVITY HEAR

.- .- :THE V. C. SUMMER NUCLEAR STATION For the Period January - March 1981 by Pradeep Talwani Principal Investigator Geology Department University of South Carolina Colu:r.bia, S. C. 29208 -

l Contract No N230519  :

' a THIS DOCUMENT CONTAINS ik

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1 INTRCDUCTICN This report presents the analysis of seismic data recorded near the V. C. Summer Nuclear Power Station in South Carolina. During the reporting period (January 1 - March 31, 1981) shallow microcarthquake activity averaged less than one locatable event per day (= 0.58 event / day).

fio events of magnitude > 2.0 were recorded for this reporting period.

INSTRULTNTATIGN The data were recorded by a four station seismic ~ network operated by S.C.E. and G. Data were also obtained from JSC, a permanent station of the South Carolina seismographic network and a portable digital event detector (stationJIM). These seismic stations are shown in Figure-1 and listed in Appendix I.

METHCD Events were located using a computer program HYP071 (Lee and Lahr, 1972) and a velocity model developed for the t'onticello Reservoir area (Appendix II). The event magnitudes are calculated from the signal durations at station JSC, were the duration (D) and tragnitude (PL )

relation is ff(

= -1.83 + 2.04 log D The daily energy release was calculated using a simplified magnitude (f() energy (E) relation (Gutenberg and Richter,1956) log 10

=

11.0 + 1.5 .1 L 1

p-2 RESULTS In the reporting period (January 1 - ffarch 31,1981)52 locatable events were recorded. These are listed in Appendix III. Figure 2 shows the cumulative events recorded in January, February and March _1981. flost events occurred in a small cluster en the western edge of the reservoir.

A cross section, 2.5 km in width from A to B is shown in Figure 3.  !!ast of the events were less than 2.0 km deep with a few events between 3 to 5 km in depth. The monthly lecctions are shown in Figures 4 - 6. A cumulative (f.om December 1977 to t' arch 1981) map is shown in Figure 7. In Figures 2 - 7 only events with an RMS of < 0.1 sec have been plotted.

COMPILRISON OF SEISHICITY WITH FESERVOIR LEVELS Monticello Reservoir is a pumped storage facility and the decrease in reservoir levels associated with power generation is recovered when water is pun. ped back into the reservoir. Correspondingly there can be variations up to about 3 feet per day between the maximum and minimum water levels. Figure 8 shows the comparison of water level to seismicity.

The top two graphs show the water level and also the change of water level per day. The log energy per day and number of events per day are shown on the lower graphs, b-VAtuEs The b-values were obtained for events occurring in three month periods. As the number of events was not large Utsu's (1971) method was used. In this method:

v4+-^-* >b * ~ ese me, - 4 '9"

3 b = SI9" IMj - sMs where Mg = sum of magnitude of all earthquakes having magnitudes equal to or larger than Ms s = total number of those earthquakes and 10 d

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+ h bl.fi/ log e 1 ban where

= factor for correcting the effort of the length of the n

magnitude interval Ali. baM is given in Table 18, p. 288 (Utsu,1971).

The b-values for three month periods beginning with January,1980 are shown in Figure 9.

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During this reporting period seismicity was at a low level. We are continuing to monitor the seismicity and will report any subsequent changes in the level of activity at t'onticello Reservoir.

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. 13 REFERE::CES Gutenberg, B. and Richter, C. F..(1956). Magnitude and energy of earthquakes, Ann. Geof. 9.-p. 1-15.

Lee,11. H. K. and Lahr, J. C. (1972) . A computer progran.for determining hypocenter, racnitude and first motion-pattern lof local earthquakes, Revisions of HYP0 71,-U.S.G.S. Open-file report, 100 pp.

Utsu,T.(1971)- Aftershocks and Eart,hquake Statistics (III);

Analysis of the distribution of earthquakes in magnitude, time, and space Withs ' pecial consideration to clustering characteristics of earthquake occurrence (1): Journal of the Faculty-of Science,

!!akkaido Univ. Series VII- (Ce'ophysics), 3, no. 5.

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APPENDIX II NONTICELLO RESERV0IR 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 t

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APPE!! DIX III LOCATION OF EVENTS Cenputer prin cut of Iri?O71 showing data for locatien.of events.

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Col =n 2 Origin ti=c (UCT) h m.sec.

Colt ==t 3~ Lati:.ude (N) ' degrees , ::in.

Colt-_n 4 Lon;itude (W) degrecs, ein.

Colt ~1 5- Depth (k=).

. Colu=n 6 Local duration =agnitude.

Colu=n / Uo. of statica reading:: used to locate event.

P and S arrivals frc= sc=e stations are regarded as 2 reading::.

Co ltr. n 8

- 4 Largest ari=uthal separatica in degrees betveen stations.

, Column 9 Epicentral. distance in km to nearest station.

Colt =n 10 Root =ean2cuarc error of ti=c residuals in sec.

I FJIS =t'R,'/MO, where R.

t is the time residual for the ith station.

Colt =n 11 +

Standard error of the epicenter in km .

Column 12 Standard error of the focal depth in k:s*.

• Statistical interpretation of standard errors in rolves ascumptions which any not be met in earthquake locations.

c:ay nct represent actual error limits.

Therefore standard errors If E?li er EK: is blank, this =erms that 2:cannot be ce=puted, because of insufficient data.

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