ML20153C618

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Seventh Quarterly Rept Cleveland Electric Illuminating Seismic Monitoring Network,Apr-June 1988
ML20153C618
Person / Time
Site: Perry  FirstEnergy icon.png
Issue date: 06/30/1988
From:
WESTON GEOPHYSICAL CORP.
To:
Shared Package
ML20153C596 List:
References
NUDOCS 8809010207
Download: ML20153C618 (18)
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Text

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SEi/EB! - GUARTERL'Y REPORT CEI SEISM 42 'OdriORING NETWORK iDRIL 1 TH, OUL. JUNE E, J o88

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Prepared for CLEVELAND ELECTRIC ILLUMINATING COMPANY l

l AUGUST 1988 "N

i Weston Geophysical CORPORATION t

8809010207 080826 DR ADOCK 0500 40

TABLE OF CONTENTS Eatt:

LIST OF FIGURES i

LIST OF TABLES 11

1.0 INTRODUCTION

1-2.0 SEISMIC NETWORK 1

3.0 OBSERVED SEISMICITY l-3.1 Epicentral Area of January 31, 1986 1

3.2 The corridor Between the January 31, 1986 Epicenter and the Injection Wells 2

3.3 Other Events Recorded by AUTOSTAR 2

4.0 DISCUSSION 3

5.0 CONCLUSION

4 6.0 REFERENCE 4

TABLES FIGURES t

l APPENDIX A FIGURE Al i

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LIST OF FIGURES FIGURE 1 Telemetered Network Station Configuration FIGURE 2A Recorded Signals for the May 28, 1988 mine blast FIGURE 2B Recorded Signals for the April 16, 1988 mine blast FIGURE 3 Cumulative Seismicity i

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LIST OF TABLES TABLE 1 Microcarthquakes in the Corridor Between the Injection Wells and the Main Shock TABLE 2 Microcarthquakes Outside the Corridor 1

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1.0 IFIEQDUCIION 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 Parry Nuclear Powei Plant, two deep injection wells operated by CALHIO, and the epicentral area. of the January 31, 1986 ealthquake. This seventh Quarterly Report covers the period from April 1 to June 30, 1988.

An update of the CALHIO volumetric injection data is also provided in Appendix A.

2.0 REI"*1IC NETWORK During this period, the Automated Seismic Telemetering and Recording System (AUTOSTAR], fully described in the third Quarterly Report, has performei in a reliable manner.

The availability of all of the field stations.sring this quarter was 87%, slightly less than in the past, due to so - tecidental damage to two remote station digitizing units and several rief losses of transmission on the ANT telephone line.

Despite these problems, CEI's monitoring capabilities of the corridor between the injection wells and the January 31, 1986 epicentral area was not reduced since the three closest stations, SCH, FOR, and WIL remained in operation, and station LEROY of John Carroll's network, very near to CEI station RAD, is an excellent back-up.

Figure 1 shows the CEI station locations around the area of interest.

i 3.0 QBIERVED SEISMICITY 3.1 Eoicentral Area of January 31. 1986 There was no earthquake activity within the epicentral area during the present quarter. The last event occurred on February 12, 1987.

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3.2 The Corridor Between the January 31. 1986 Eoicenter and the Injection W ils

.f During this quarter, there was' no seismic activity observed in the corridor, the primary area of interest.

This conclusion is based' on the routine review of all the events that triggered the digital system, and also a visual scanning of all the analog recordings from the five stations.

The cumulative seismicity map will be reproduced; table 1 gives the complete list of microcarthquakes recorded up to this date in the corridor.

The last event within the corridor occurred on February 12, 1987.

3.3 Other Events Recorded by AUTOSTAR During the period covered, AUTOSTAR triggered on several local and regional quarry blasts.

It also recorded digitally one microcarthquake on April 20, and four others on June 27, 1988, all of them originating outside the CEI network to the northwest.

On Saturday May 28, at 16:18:28 (U.T.), Autostar recorded an event from the coal mining area in the vicinity of Zanesville, Ohio.

The signature of this event was almost identical to that of many mine blasts known to occur in that region.

Possibly because it occurred on a Saturday, was larger (Me = 3.4) than usual and was recorded by many stations of the USGS net, it was temporarily identified as an earthquake in southern Ohio and released to the Press as such.

Figures 2A and 2B compare this May 28, 1988 event with one from April 16, 1988, also on a Saturday.

At present, its nature has been relabeled as "probable explosion", in the Preliminary Determination of Epicenters, Bulletin #22-88 (June 23, 1988).

Coordinates given are 39.754N, 81.613W.

As stated, CEI concurs with tnis label of a probable explosion.

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1.4) triggered On April 20, 1988 a small microear' uake (Mc

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AUTOSTAR at 16:51:25.52 (U.T.).

After exchange of data, the John Carroll University Observatory calculated a preliminary solution placing.the epicenter offshore, north of Mentor Headlands.

On June 27, AUTOSTAR recorded a short microcarthquake sequence.

The main shock and three of its aftershocks were large enough to trigger the digital system; two other smaller aftershocks were only visible on a few of the analog a31smograms.

The estimated coda magnitudes were:

2. 8, 0. 2, 1.7, - 0.1, 1.3 and 0.7.

Origin times were respectively at 4:46, 4:47, 4:48, 6:55 and 8:29 (U.T.).

An M 2.7 was

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big calculated from Ig-wave amplitudes of the main shock by the Geological Survey of Canada.

From comparison of the digital files, the main shock and aftershocks are inferred to have a common source, based on identical first motions and arrival times.

With the use of shared data from the CEI and JCU networks, John Carroll Observatory calculated a preliminary solution placing the epicentral location

offshore, north of Painesville-on-the Lake.

This sequence was approximately 4.5 miles from PNPP.

No seismic triggers (.005g) or alarms were experienced at the site.

Table 2 presents the solutions obtained by Rev. W. Ott of John Carroll University.

Figure 3

shows the two offshore epicenters, on a cumulative seismicity map, i

4.0 DISCUSSION i

j The absence of seismic activity during this quarter within the CEI's network aperture is not unusual, since in the spring and summer of 1986, similar quiescence had been observed.

There is still no clear correlation between observed micro-seismicity within the net and the injection data.

The occurrence of lov level activity outside the CEI

network, including offshore, is consistent with the historical pattern of l

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seismicity.

The April 20, 1988 microevent is not considered related to the deep injection well located east of Fairport Harbor, because of the separation distance. The possibility of a salt mine subsidence or collapse was considered, in view of the spatial coincidence with mining operations, but at this time cannot be verified.

The June 27 sequence is not accurately located because of the large station azimuthal gap to the north.

Regardless of the small ERH calculated, the uncertainty should be considered larger, Efforts to. obtain arrival times at northern stations in Ontario failed because of a time-signal problem experienced on that day at the University of Western Ontario.

The occurrence of these offshore events is consistent with the possible offshore epicentral location considered for the December 3,.

1951 earthquake recently reexamined (WGC. 1988).

In general, the occurrence of small events in the region is not surprising but normal within the context of random activity expected in a tectonic province type of seismic hazard zoning. This includes offshore events.

5.0 CONCLUSION

The second quarter of 1988 saw no micro-activity in the corridor monitored by CEI. A small sequence of six events occurred offshore of i

Painesville-on-the-lake on June 27, with the main shock having an Me =

i 2.7.

This event was not felt and PNPP seismic instrumentation did not trigger or alarm.

A mine blast originating southeast of Zanesville, Ohio was temporarily identified as an earthquake.

Some historical events may have been similarily mislabeled.

i 6.0 REFERENCE Weston Geophysical Corporation, 1988, Analyses of Northeastern Ohio Seismicity and Tectonics, prepared for the Cleveland Electric Illuminating Company, 64p.

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TABLES t

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TABLE 1 MICR3E ARTH 3UAX E5 IN THE CCRRIDOR BETWEEN THE INJECTION W ELLS AND THE M AIN SHOCK YEAR PO LY HRMISEC LAT.N LONG.W D

2MS EN EZ NP NS GAP MC SO j

I 1986 0 3 12 C 3 5 526 6 41.7272 31.1707 2.0 0.36 0.7 0.4 10 6

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1S86 C9 Zd 103604.2 41.7 47 31.1091 2.3 0.04 0.3 0.4 11 6

174

.3 WG 1986 10 20 105944.7 41.7187 81.1453 3.0 0.07 1.7 2.0 6

4 337

.6 WG 1986 10 27 122555.5 41.7435 81.C944 2.9 0.07

2. 7 1.5 6

3 221

.2 WG j

'586 11 33 035449.5 41.7C98 31.1292 1.8 3.06 0.5 0.5 7

5 145

.3 kG ISa6 12 01 050317.5 41.7320 31.1195 2.1 0.07 0.6 5.8 7

5 183

.2 WG l

19d6 12 24 393733.9 41.7437 S1.2392 1.0 0.04 a.5 6.7 6

3 306

.3 WG 1587 01 02 324214.3 41.7472 S1.1027 2.0 0.06

0. 3 0.5 10 6

174

.6 WG i

1987 01 28 235d29.3 41.7219 81.0974 2.1 0.03 0.4 0.7 6

5 199

.7 WG 1987 02 23 114556.4 41.7184 31.1197 2.0 0.03 0.1 0.3 10 7

100

.5 WG j

1537 02 28 204644.5 41.7451 31.0932 2.4 0.07 1.0 1.7 7

4 239

.4 WG 1587 C 5 01 211332.3 41.7466 S1.0872 1.9 0.06 0.3 0.2 7

4 196

.6 WG i

1987 05 31 211352.1 41.7466 31.0921 2.4 0.38 0.2 0.8 15 9

100 1.3 WG i

1587 C5 02 183307.7 41.7475 31.C932 2.0 0.02 0.1 3.0 6

4 174

.6 WG 1987 C5 02 202526.5 41.7424 S1.0389 2.7 0.08 0.3 0.6 14 8

115

.4 WG i

1987 C 7 0 8 034835.2 41.7292 31.1037 2.7 0.07 0.7 1.1 8

5 166

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19 87 Ca 15. 052 637.7 41.6?94 31.1472 2.8 0.06 0.2 1.0 10 6

133

.1 WG 1987 13 10 090610.4 41.7430 31.1030 1.9 0.04

0. 3 0.2 7

5 166

.6 WG 1937 10 14 195S24.3

41. 715 C 31.1318 3.4 0.04 1.6 0.7 6

3 190

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1537 13 22 024919.9 41.6989 31.1447 2.2 0.04 0.2 3.8 9

5 120

.1 WG 1583 01 16 222403.

41.747 SI.098 2

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j 1988 01 16 223010.

41.747 31.C98 3

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1988 01 16 231704.4 41.7474 81.0981 2.0 0.05 0.5 0.3 9

5 185 1.8 WG ISd8 01 17 024821.7 41.7467 S1.0997 1.9 0.06 0.5 0.3 10 5

180 0.5 hG 1988 01 17 032235.

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1938 01 17 092403.

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1988 01 17 131551.

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k ISa6 32 05 155537.0 41.7251 S1.0907 2.0 0.04 0.4 0.2 10 5

195 0.5 WG b

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REVISED JULY 1983

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MICR DE AR TH QU A KE S CUT SIDE THE CURRIDC2

-- APRIL TO JUNE 1938 YEAR M0 DY H2MISEC LAT.N LONG.W D

RMS EH EZ NP NS GAP MC 50 a

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j 1988 C4 20 165127.9 41.[7738 81.3085 3.3 0.05 0.2 2.0 16 10 221 1.4 JC U 1S88 C6 27 044631.3 41.8180 31.2293 2.2 0.06 0.2 7.4 22 11 239 2.7 JCU 1

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RECORDED SIGNALS FOR MAY 28,1988 MINE BLAST F;gute 2a Weston Geophysical

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CUMULATIVE SEISWCITY 1/1986 6/1988 8

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THE CLEVELAND ELECTRIC ILLUMINATING COMPANY DAILY INJECTION VOLUME AND OBSERVED SEISMICITY 1988 Figure A1

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