ML20246K370

Eleventh Quarterly Rept CEI Seismic Monitoring Network for Apr-June 1989

ML20246K370
Person / Time
Site:	Perry
Issue date:	06/30/1989
From:	WESTON GEOPHYSICAL CORP.
To:	CLEVELAND ELECTRIC ILLUMINATING CO.
Shared Package
ML20246K360	List: ML20246K370 PY-CEI-NRR-1055, Forwards Eleventh Quarterly Rept - CEI Seismic Monitoring Network,Apr-June 1989
References
NUDOCS 8909050451
Download: ML20246K370 (14)

Text

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. r-1' ELEVENTH QUARTERLY REPORT CE! SEISMIC MONITORING NETWORK .

APP.IL 1 THROUGH JUNE 30,1989

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1.3 INTRODUCTION

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2.0 SEISMIC NTTWORK 1:

' 3.0 OBSERVED SEISMIF.ITY: 2 f- >

13.1 Epicentral Area of January 31,'1986 2

' ' .' 3.2 lThe Corridor between the January 31,1986 Epicenter and the Injection Wel 3 . 2 y-  : 3.3.~ Other Events Recorded by AUTOSTAR 2 4.0 DISC SSidN . 2

15.0 CONCLUSION

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-6.0 ACKNOWLEDGEMENT 3 FIGURES

- APPENDIX A: CALHIO VOLUMETRIC INJECTION DATA I' ~

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LIST OF TABLES TABLE 1 Microearthquakes Within the CEI Micronet Aperture and its Immediate Vicinity l

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LIST OF FIGURES FIGURE 1 Seismicity; April- May-June 1989 FIGTJRE 2 Cumulative Seismicity 1/31/1966 - 6/30/89

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1.0 INTRODUCTION

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 Purry Nuclear Power Plant, two deep injection wells operated by CALHIO, and the epicentral area cf the January 31, 1986 earthquake. This eleventh Quarterly Report covers the period from April I to June 30, 1989. An update of the CALHIO volumetric injection data is also provided in Appendix A.

2.0 SEISMIC NETWORK During the second quarter of 1989, the Automated Seismic Telemetering and Recording System (AUTOSTAR) performed quite reliably, achieving an uptime for network operation of 87%. Most of the downcime, calculated in station-hour units, was due to the failure of one remote site REF TEK #97 unit and the month long repair time. By moving the unit from station ANT to station SCH, where the failure occurred, the detection capabi'ity over the Calhio Wells - Leroy epicentral area area co ridor was maintained relatively unchanged.

By the end of June, CEI and Weston Geophysical completed the installation of a new seismic station in Ashtabula County. The coordinates are 41_8463 N and 80.9902 W; the elevation is 181 meters. The station, with code name GEN, is located between Madison-on-the-Lake and Geneva-on-the-Lake. It is equipped with a 2Hz vertical L4 seismometer. The analog signal is telemetered via telephone line to the PNPP seismic laboratory, where it is recorded on a Geotech RV-301 Helicorder. With this additional station, the original aperture of the CEI net has been expanded to include the epicentral area of the December 25, 1928 (Mc=2.4) tremor south of Madison-on-the-Lake.

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3.0 OBSERVED SEISMICITY 3.1 Epicentral Area of the January 31,1986 Earthquake There was no microearthquake activity detected during the quarter. The last event reported occurred on December 28,1988. l 3.2 The Corridor between the January 31,1986 Epicenter and the Injection Wells During this quarter, AUTOSTAR detected on May 30, one microcarthquake, with Mc --0.4 within the network aperture. The standard location parameters of this event are listed on Table 1 and the epicentral location is plotted on Figure 1.

Station and injection welllocations are also included on the same figure. Figure 2 presents the cumulative seismicity since January 31,1986.

3.3 Other Events Recorded by AUTOSTAR One other microcarthquake, with Mc=-0.4, was detected by AUTOSTAR on Junr;

15. The calculated epicenter, well outside CEI network itperture, is locsted in the vicinity of injection wells in Fairport Harbor. Location parame<en, ia e listed ..

on Table 1; the epicenter is shown on Figure 1.

4.0 DISCUSSION The microseismicity observed during tMs second quarter is notably low. Almost nothing has been contributed to the data base, and thus no advance was made towards a better understanding of the previous observations.

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5.0 CONCLUSION

Two small microearthquakes were located by AUTOSTAR during the second quarter of 1989. One was located within the network aperture; the other occurred outside the aperture in the general area of Fairport Harbor. Such low seismic activity does not improve the current interpretation of e'ther the local j or regional seismotectonics.

6.0 ACKNOWLEDGEMENT 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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TIME Data provided by ICI Americas, Perry, Ohio Solid lines represent Well #1 Dashed lines represent Well 42 PERRY NUCLE AR POWE R PL ANT ENPts THE CLEVELAND CLECTRic Mu ILLUMINATING CC.MPANY DAILY INJECTION VOL UME AND OBSERVED SEISMICITY 1989 Figure A-1 l - _ - - _ - _ _ _ _ _ _ _ _ _ - _ _ _ . . _ - _ _ - - _ - - - - _ _ .