ML20070G529

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Sixteenth Quarterly Rept Cleveland Electric Illuminating Co Seismic Monitoring Network,Oct-Dec 1990
ML20070G529
Person / Time
Site: Perry FirstEnergy icon.png
Issue date: 12/31/1990
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WESTON GEOPHYSICAL CORP.
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NUDOCS 9103120166
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SIXTEENTH QUARTERLY REPORT CEI SEISMIC MONITORING NETWORK OCTOBER 1 THROUGH DECEMBER 31,1990 Prepared for l CLEVELAND ELECTRIC ILLUMINATING COMPANY FEBRUARY 1991 >

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TABLE OF CONTENTS

Page LIST OF TABLES 1 LIST QF FIGURES 11 1.0 ' INTRODUCTION 1 2.0 ' SEISMIC NETWORK- 1 3.0 OBSERVED SEISMICITY 1 3.1 Epicentral Area of January 31,1986 1 3.2 The Corridor between the January 31,1986 Epicenter and the. Injection Wells 1 3.3 Other events Recorded by AUTOSTAR- 2 4.0 - DISCUSSION 2 4.1 Epicentral Area of January 31,1986 2

- 4.2 The Corridor between the January 31,1986 Epicenter and the injection Wells 2

-4.3: Other events Recorded by AUTOSTAR 3

5.0 CONCLUSION

3 6.0 ACKNOWLEDGEMENT 4 TABLES L FIGURES -

f l APPENDIX A f

-ICI AMERICAS PRESSURE AND VOLUMETRIC INJECTION DATA 1

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LIST OF TABLF3 TABLE 1 Microcarthquakes inside the CEI Micronet Aperture or in the immediate Vicinity (January 1 to December 31,1990) l

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LIST OF FIGURES FIGURE 1 Seismicity; October, November, December 1990 FIGURE 2 Cumulative Seismicity (1/31/1986 - 12/31/90)

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1.0 INTRODUCTION

in accordance with its agreement with the U.S.- Nuclear R^gulatory 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 ICI Amc .cas, Inc.,

(formerly CALH;O) and the epicentral area of the January 31, 1986 earthquake.

This sixteenth Quarterly Report covers the monitoring period from Octcber 1, 1990, to December 31, 1990. In addition, Appendix A provides the volumetric data from the two ICI Americas wells for the same period.

2.0 . SEISMIC NETWORK During the fourth quarter of 1990, the Automated Seismic Telemetering and Recording System (AUTOSTAR) and the Geneva staion performed quite reliably with a total uptime percentage of 96.3% Most of the downtime was caused by telephone line problems.

3.0 OBSERVED SEISMICITY 3.1 Epicentral Area of the January 31,1986 Earthquake f

There was no recorded seismic activity during this quarter from the Leroy epicentral area. The last reported event occurred on September 1,1990.

3.2 The Corridor between the January 31,1986 Epicente and the Injection Wells During this quarter, there was no seismic activity detected in the corridor.

Considering that toe seismicity rate of this area is very low, the absence of activity is not anomalous. In the vicinity of the corridor, three small microeat thquakes (Mc=0.5, 0.2, and 0.3) occurred east of Station FORD, near Dewey Ro.d on October 21, 22 and November 12. This is an area where other small events have occurred in the past, not long after some recently drilled gas wells began praduction. l.ocations are listed on Table 1 and shown on Figure 1.

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i 3.3 Other Events Recorded by AUTOSTAR Several microcart' 8) ,, w th locations outside the CEI network aperture were detected by AUTOSTA - aring this period. One event, Mc41.7, occurred on November 9, near Fairport Harbor; it .as not reported , Jt". Two other events (Mc=-0.4,1.3) on October 4 and December 7 have offshore locations. Figure 1 shows the epicentral locations of these three ever.ts. Table 1 presents the standard location parameters. Figure 2 shows the cumulative seismicity observed in the area since the January 31,1986 earthquake.

4.0 DISCUSSION 4.1 Epicentral Area of the January 31,1986 Earthquake The absence of activity during one entire quarter is not new. One isolated event, with Mc=15, occurred this year, on Septeraber 1. Prior to this event, on December 28, 1988, another isolated tremor with Mca2.8 had occurred. These two events are considered to be individually separated from the af tetshock sequence of the 1986 main shock. This time dist-ibution of the activity at Leroy is similar to patterns observed from other typical tectonic sources of the Northeast.

4.2 The Corridor Between the January 31,1986 Epicenter and the Injection Wells The lack of activity within the corr; dor during this quarter matches well the relatively small number of events observed this year. There is no obvious explanation for this apparent decrease. In view of the low magnitudes and shallow focal depth estimates associated with all the events forming a distinct cluster east of the two Calhio wells, one can hypothesize that, if the fluid injection has any causal effect on their occurrences, it must be in reducing the friction along boundaries of pre-existing small crustal blocks, thus allowing the release of compressional energy from the regional stress field.

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Since the average focal depth of these events coincides with the depth of injection or lies just below it, the causal relationship is more likely to exist there than at Leroy, where the activity is clearly occurring at a greater depth (4 to 6 km). Over a period of five years, the two areas have remained separated by an aseismic zone.

4.3 Other Events Recorded by AUTOSTAR During this quarter, several events occurring well outside the network aperture were detected and located by Autostar, with additional phase arrival times provided by the John Carroll University network. These local events, shown on Figure 1, have all occurred in areas where seismicity has been previously observed, (Figure 2) except for the event of December 7 that occurred offshore.

It should be noted though that in June 1988 several microcarthquakes also occurred offshore to the southwest of the December event. The epicentral location of this event suffers from a large azimuthal gap and consequently should be regarded as having a larger uncertainty.

The occurrence of another Fairport Harbor ever? not far from the location of an injection well which went operationalin 1985 can be interpreted as an indication I of a possible causal relationship, based on the close proximity. However, due to the absence of a nearby seismic station, it is not possible to determine accurately the focal depth, an important parameter in the studies of induced seismicity.

5.0 CONCLUSION

S The CEI seismic network operated very reliably during the last quarter of 1990.

This period was relatively quieter than usual since no seismicity was recorded both in the Leroy epicentral area or in the corridor joining the latter to Calhlo injection wells. The monitoring of these two areas constitutes the prime object of CEI commitment to the U.S.N.h * :. There is no change in CEl's interpretation of the local seismicity as explain d in previous quarterly reports, especially #13, which defines the 1986 Leroy earthquake as purely tectonic in origin.

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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 data from his network Considering the small aperture of CEl's network, the additional data are critical to the locationing of several events, l

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TABLE 1 I

F:CRCEAR7HOUAKES INSIDE THE MICRONET APERTURE OR IN TH E IMMEDIATE VICINITY 1990 NC. YEAR MODY HRMNSEC LAT.N LONG.W D RMS EH E! N NS GAP MC 50 TR.NO

1. 19S0 0331 025525.5 41.7303 S1.1001 2.0 0.C5 0.3 0.6 9 5 134 2 WG 4938
2. 1990 0505 212924.0 41.7111 S1.0556 2.1 0.03 0.2 1.5 13 8 194 .2 WG 5086
3. 1950 0519 22282S.5 41.6901 31.1269 2.1 0.05 0.2 13.0 3 5 153 .2 WG 5153
4. 1950 0522 140632.2 41.7026 81.1119 2.2 0.05 0.3 3.9 3 5 162 .3 WG 5159
5. 1950 0526 035113.9 41.7498 S1.2624 2.4 0.04 0.2 3. 8 13 8 196 1.3 WS 5197
6. 1990 0526 120735.4 41.7300 81.0774 2.3 0. G 3 0. 2 0.2 10 5 236 .1 WS 5193
7. 1990 GE OS 0 2534?.3 41.7590 31.2501 2.6 0.03 0.2 1.9 8 4 307 .2 WG 5457
8. 1950 0812 102352.0 41.7340 81.0761 2.3 0.02 0.1 0.2 10 5 237 .2 WG 5480
9. 19S0 0301 135054.5 41.6479 31.1516 4.6 0.03 0.2 0.3 17 9 82 1.5 WG 5570 10.1990 1004 04G303.7 41.7331 81.2123 6.9 0.05 0.5 1.0 9 5 252 .4 WG 5732 11.1990 1021 132313.5 41.7113 81.0552 2.0 0.04 0.1 0.2 13 E 195 .5 WG 5795 12.1990 1022 122847.5 41.7127 81.0545 2.d 0.04 0.2 3.0 14 9 146 .2 WG 5796 13.1990 1109 224333.2 41.7472 81.2493 2.5 0.03 0.2 2.4 13 8 258 1.7 WG 5910 14.1950 1112 142425.5 ?1. 712 5 B 1. 0 5 8 9 2.20.030.3 0.9 9 5 230 .3 VG 5919 15.1950 1207 044319.5 41.9641 91.0155 3.0 0.C3 0.4 3.8 13 9 324 1.3 WG 6001 JAN 31, 1971 E

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