ML20083Q573

Seismic Activity Near VC Summer Nuclear Station for Period Apr-June 1982

ML20083Q573
Person / Time
Site:	Summer
Issue date:	02/22/1983
From:	Talwani P SOUTH CAROLINA, UNIV. OF, COLUMBIA, SC
To:
Shared Package
ML20083Q558	List: ML20083Q555 ML20083Q573
References
82-2, NUDOCS 8302250442
Download: ML20083Q573 (19)

Text

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. TECHNICAL REPORT 82-2 SEISMIC ACTIVITY NEAR THE V.C. SUMMER NUCLEAR STATION For the Period -

April - June 1982

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fi 2 by -

i-Pradeep Taiwani

't:- Principal Investigator l- l ,,

Geology Department $

[ University of South Carolina ~

Columbia, S.C. 29208

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Contract No. N301315

[{iss2X8882o!888 Sis

b Technical Report 82-2 SEISMIC ACTIVITY N.2AR THE V. C. SUMMER NUCLEAR STATION For the Period April - June 1982 l

l L hy Pradeep Talwani-Principal Investigator Geology Department University of South Carolina Columbia, S.C. 29208

. Contract No. N230519

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i: INTRODUCTION.

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- This. report presents a summary of seismic activity near the LV. CD Sumer Nuclear Power Station:in South Carolina for th.e' three

. month period between April 1 and June 30,'1982. During this reporting -

.. period a total lof 110 -locatable~ events-were recorded of which six-l were of magnitude 2.0 or greater.

~ 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 is also used.

Location of all these stations is shown in Figure 1, and their co-

. ordinates are listed in Appendix 1.

DATA ANALYSIS ,

location of the events is determined by using HYP071 program (Lee and Lahr,1972) and the velocity model given in Appendix II. The event magnitude (M L

) is deterained from signal duration at Station JSC, using the following relation:

ML = -1.83.+ 2.04 Log D where.D is the signal duration (seconds).

An estimate of' daily energy release is determined using a simpli-fied magnitude (ML ) energy (E) . relation by.Gutenberg and Richter,1956.

log 10E = 11.8 + 1.5 Mt P'

utv sa fS * #. 3 - t

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2 RESULTS

'The'110 locatable eventsLrecorded during the April 1 through w'

' June 30,'1982 reporting period are listed in Appendix III. .The major

., portion of the seismic activity (72%) occurred in April', including the six events of magnitude 2.0 or greater (Table-1). Nineteen events were of magnitudes between l.0 and 2.0 -(Table 2), and the remaining events (77%) were small (ML < l.0). Depth estimates indicate that 49% of the activity during this period occurred at depths between 1.0 and_2.0 km'and 33% at depths greater than 2.0 km. Two events with calculated depths greater than 7.0 km (April 7, 0947, 7.07 km; April 12, 1009, 7.17 km) were B quality. events and had vertical errors of 1.0 km.

However, past experience in relocating events with magnetic tape data suggests that these depth estimates may be greater than the true depths.

A swarm of seven events. occurred near Blair, S.C., approximately 13 km

= northwest of the V. C. Summer Nuclear Station, on May 7, 1982, with the main shock having a magnitude of 2.07 (Fig. 4). b A cumulative plot of the epicenters of the events located during the reporting period is shown in Figure 2. 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 pumped back into the reservoir. There can be variations up to about

^ We have 4 feet per day between the maximum and minimum water level.

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 6 shows the comparison of

3 TABLE 1 Date' Time (U.T.C.) Magnitude April 3 12325 ,2.05 April.13- 0925 2.80 April 14. '0529 12.58-April 16 0125 2.00:

April 16 '1138.

2.19 April 26 1930 2.05 TABLE 2

~

Date' Time (U.T.C.) Macnitude April.1- 0808 1.37

~ April-1 2315 1.09 April 2 0312 1.48 April 3 0408 1.18-

-April 3 0446 1.09

-April'3 0947 1.78 April 3 2014 1.06 April 3 .2326 1.'46 April 3 2330- 1.02 April 4 2154 1.21 April 5 '0918 1.65 April 6 0858 1.34 April 6 1003 1.64 April 16 0728 1.02 April 18 2003 1.12 May 16 1211 1.21 May 16 1504 1.54 May 22 0337 1.32 May 27 1050 1.44

'4--

water level to seismicity. The top two' graphs show the water level

- .and _the change of water . level per day.- The number off events per day and logfof energy released per day are shown on the lower two graphs.

LThe. histograms showing events per day and log of energy release.

include also the unlocated events around the reservoir.

CONCLUSIONS

- Seismic activity during this reporting period-(April 1 -

June 30, 1982)-shows1an increase similar to the increases during the same stime interval for the previous two years. ' A deepening of seismicity as well as possible migration are also indicated by the occurrence of ~

earthquakes at greater depths and at locations outside the immediate Monticello Reservoir area.

A histogram of the number of events per month from December.

-1977.through June, 1982 (Fig. '7) suggests that seismic activity at Monticello Reservoir is continuing in a trend of discrete swarms separated by periods of low level . seismicity. The April svarm can be interpreted as a continuation of this trend and the low level of

~

activity of May and June as the beginning of 'a: quiet period. Thus, the general level of seismicity over a longer period does not appear to be decreasing, but appears to be continuing sporadically.

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 determining hypocenter, magnitude and first motion pattern of local earthquakes, Revisions of HYP0 71, U.S.G.S. Open File Report,100 pp.

5 17

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4 STATION' LOCATION-NO. 'STN. LAT. N'. LONG.:W.

' l .' 001; ,. .34 19.91' 81 17.74' 2- 002 340 11.58' 81 13.81' 340 21.09' 810 27.41'

~3 003 4 004 340 25.72' 8iO12.99' J5 'JSC 340 16.80' 810 15.60' 6~ -008- 34 24.53'. 81 24.55' 9

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'MONTICELLO RESERVOIR VELOCITY MODEL Velocity' ' Depth km/sec- km

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