ML19332F388

Twelfth Quarterly Rept Cleveland Electric Illuminating Seismic Monitoring Network,Jul-Sept 1989.

ML19332F388
Person / Time
Site:	Perry
Issue date:	09/30/1989
From:	WESTON GEOPHYSICAL CORP.
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ML19332F386	List: ML19332F385 ML19332F388
References
3128J, NUDOCS 8912140361
Download: ML19332F388 (14)

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TWELFTH QUARTERLY REPORT CEI SEISMIC MONITORING NETWORK ,

JULY 1 THROUGH SEPTEMBER 30,1989 i i

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Prepared for CLEVELAND ELECTRIC ILLUMINATING COMPANY NOVEMBER 1989 0

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- LIST OF TABLES i  ;

LIST OF FIGURES 11 I

1.0 INTRODUCTION

- 1 2.0 SEISMIC NETWORK 1 ,

3.0 OBSERVED SEISMICITY 1 ,

3.1 Ep! central Area of January 31,1986 1 3.2 'The Corridor betweer, the Janut.ry 31,1986 Epleenter and the injection Wells 1 3.3 Other Events Recorded by AUTOSTAR 2

' 4.0 DISCUSSION 2

5.0 CONCLUSION

3 6.0 ACKNOWLEDGEMENT 3 7.0 REFERNCES 3 FIGURES APPENDIX A: CALHIO VOLUMETRIC INJECTION DATA 3128J Weston Geophysical y - - --

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,-~ TABLE 1 Microcarthquakes Within the CEI Micronet Aperture  :

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LIST OF FIGURES FIGURE '1 Selsmicity; July - August - September 1989 i

. FIGURE 2 Cumulative Seismicity 1/31/1986 - 9/30/89 9

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1.0 INTRODUCTION

1 In accordance with its agreement with the U.S. Nuclear Regulatory Commission, Cleveland Electric Illuminating (CEI) continues to monitor the seismic activity in a restricted region of Northeastern Ohio, encompassing the locale of the Perry Nuclear Power Plant, two deep injection wells operated by CALHIO, and the epicentral area of the January 31, 1986 earthquake. This twelfth Quarterly'

- R'eport covers the period from July 1 to September 30, 1989. An update of the CALHIO volumetric injection data is also provided in Appendix A.

2.0 SEISMIC NETWORK  ;

During the third quarter of 1989, the' Automated Seismic Telemetering and Recording System (AUTOSTAR) and the Geneva Station performed quite reliably, achieving an uptime for network operation of 93% Most of the

- downtime, calculated in station-hour units, was due to the intermittent operation of one remote site REF TEK #97 unit at Station ANT. This problem is ,

apparently related to telephone line noise. The detection capability over the Calhio Wells - Leroy epicentral area corridor was relatively uneffected.

. 3.0 OBSERVED SEISMICITY 3.1 Epicentral Area of the January 31,1986 Earthquake There was no microcarthquake activity detected during the quarter. The last event reported occurred on December 28,1988.

3.2 The Corridor between the January 31,1986 Epicenter and the Injection Wells l

t During this quarter, AUTOSTAR detected one microcarthquake, with M c=0.9 within-the network aperture. The standard location parameters of this July 19 event are listed on Table 1 and the epicentral location is plotted on Figure 1. ,

Station and injection well locations are also included on the :;ame figure. Figure 2 presents the cumulative seismicity since January 31,1986.

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3.3 Other Events Recorded by AUTOSTAR During the quarter, CEl's network located several events outside the corridor.

On July 21, a small microcarthquake (Mc =0.2) originating in the vicinity of Fairport . Harbor was recorded. On August II, a Mc=1.2 event occurred just east of Madison-on-the-Lake. Location parameters for these two events are

_ listed on Table 1 and the respective epicenters plotted on Figure 1.

The network also recorded a short sequence of thirteen microcarthquakes, starting on August 1, with two M =2.8 c and 2.9 events. The epicenters are located in the same area, east of Ashtabula, where similar activity, presumably induced by an injection well, was observed in July 1987 (Armbruster et al.1987).

These two events were lightly felt in the Ashtabula area and reported in local newspapers. As expected, the Perry in-plant strong motion instrumentation did not trigger on these events due to their size and distance.

On August 5, a small earthquake (Mc=3.2) from Western Lake Ontario, near Hamilton, Ontario, was also recorded by AUTOSTAR; seismic wave arrival times were provided to the Geological Survey of Canada.

4.0 DISCUSSION The microseismicity observed in the area of interest during the last three months was very low. Thus, it does not seem that the pattern of seismicity within the ,

corridor has changed in any way to support any new discussion.

The August 11,1989 microcarthquake (Figure 1) occurred just at the time when the ~ paper was being changed on the Geneva station helicorder. Without a reading from this nearby station, there is a large focal depth uncertainty (see Table 1) for this event which is located well outside the digital network.

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On the other hand, the occurrence of a third episode of low microseismicity near:

the injection well at Ashtabula suggests an apparent periodicity. The original '

f sequence started on July 13,1987, the second episode on December 19,1987,and this last one on August 1,1988. Judging from this limited data, one might infer

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that, given a continuous injection rate, small events, less than M c=3.0 occur every six to seven months (Leblanc and Ott, 1989). If such a regime is confirmed, it does not present any significant seismic hazard for the Ashtabula area. ,

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5.0 CONCLUSION

Only one small event, Mc =0.9 occurred in the injection wells - epicentral area .

corridor during this quarter.

6.0 ACKNOWLEDGEMENT I

CEI and Weston Geophysical are grateful to Rev. W.R. Ott, S.J., of the John Carroll University Seismological Observatory, for contributing additional phase arrival times for several seismic events detected by the CEI network.

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7.0 REFERENCES

f g Armbruster, J.G., Seeber, L. and Evans, K., The July 1987 Ashtabula earthquake (M =3.6) sequence in Northeastern Ohio and a deep injection well. Abstracts c  ;

of E.S.S.S.A., St. Louis University, October 1987, p.7.

Leblanc, G. and Ott, W.R., Renewed microseismicity near Ashtabula, Ohio.

Abstracts of E.S.S.S.A., University of Kentucky, October 1989, p.13.

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.T AB LE- 1 MICRDE ARTHOUAK ES INSIDE OR NEAR THE CEI MICRONE 7D APERTURE i

YEAR PODY HRMISEC L A T.N LONG.h D RMS- EH EI. NP NS GAP MC 50 TRIG.NO-  !

1599 0103 120244.5 41.7287.81.1328 2.1 0.06 0.2 11.0 8 5 226 .1 WG 3623 1569 C130 032527.0 41.7018 81.1846 2.0 0.04 0.4 13.2 10 6 182 ~ .2 hG 3661 1S99 0130 185020.8 41.7334 81.0983 2.0 0.04 0.2- 0.4 11 5 155- .2 bG 3663 1589 C309 033045.8 41.7105 81.0531 2.0 0.04 0.2 15.1 13 8 187 0.6 WG 3719 1589 0310 165722.4 41.7107 81.0585 1.9 0.04 0.2 0.1 10. 6 186 .2 hG 3725

1S89 0312 192349.6 41. 7113 81.0596 2.0 0.04 0.213.213 3 185 0.1 WG 3729 -

1989 C322 201335.9 41.7269 81.1545 2.1 0.03 0.1 1.4 16 9 119 1.9 WG 3770 1589 C 325 233507.9 41.7468 81.2653 2.2 0.06 0.315.314 9 184 0.3 kG ~3786 .;

i 1589 0530 142039.6 41.7188 81.1222 2.1 0.04 0.1 3.0 7 4 115 .4 hG 3953 1

1589 0615 164751.6 41.7475 81.2570 2.0 0.04 0.3 17.2 11 6 273 .4 hG 4023 1589 0719 085451.1 41.7261'81.1542 2.1'O.05 0.1 2.0 16- 8 161 .9 kG 4132

1599 0721 052202.4 41.7435 81.2595 1.7 0.03 0.1 0.5 9 5 280 .2 W3 4134 1989 0911 115354.3 41.8378 81.0192 2.0 0.03 0.3 14.4 9 5 320 1.2 bG 4211 OC T. 1989 8

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PERRY NUCLE AR POWER PL ANT THE CLEVELAND ELECTRIC

_ ILLUMIN ATING COMPANY DAILY INJECTION VOLUME AND OBSERVED SEISMICITY 1989 Figure A-1