ML20147F702
| ML20147F702 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 12/30/1987 |
| From: | WESTON GEOPHYSICAL CORP. |
| To: | |
| Shared Package | |
| ML20147F689 | List: |
| References | |
| NUDOCS 8801210383 | |
| Download: ML20147F702 (12) | |
Text
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FOURTH QUARTERLY REPORT CEI SEISMIC MONITORING NETWORK JULY 16 THROUGH OCTOBER 15,1987 Prepared for CLEVELAND ELECTRIC ILLUMINATING COMPANY DECEMBER 1987 l
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1 Weston Geophysical CORPOR ATION I
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8801210303 00o118 DR ADOCK 05000 0
TABLE OF CONTENTS Page J
1.0 INTRODUCTION
1 2.0 SEISMIC NETWORK 1
3.0 OBSERVED SEISMICITY DURING THE QUARTER 1
3.1 Epicentral Area of January 31, 1987 1
3.2 Injection Wells - January, 1986, Epicenter Corridor 1
3.3 Other Evente Recorded by AUTOSTAR 2
2 4.0 DISCUSSIONS 3
5.0 CONCLUSION
i APPENDIX 1 CALHIO INJECTION WELL DATA 1616J Weston Geophysical
1.0 INTRODUCTION
As agreed with the U.S.
Nui. lear Regulatory Commission, Cleveland Electric Illuminating [CEI] continues to monitor the seismic activity in an area of northeastern Ohio that includes the perry Nuclear power Plant, two deep injection wells operated by CALHIO, and the epicentral region of the January 31, 1986 earthquake.
This fourth quarterly report, prepared by Weston Geophysical for CEI, covers the period from July 16 through October 15, 1987.
It also provides in an appendix, the injection data collected from March 1986 to September 1987.
2.0 SEISMIC NETWORK During the last
- quarter, the Automated Seismic Telemetering and Recording System {AUTOSTAR) has been in operation, and was in the last stage of testing.
Figure 1 shows the station locations around the area of interest.
Hardware and software problems were resolved, allowing removal of the supporting portable ME7 800 instruments and Weston Geophysical's on-site seismologist at the end of October.
A more detailed description of AUTOSTAR was included in the third quarterly report.
3.0 OBSERVED SEISMICITY DURING THE OUARTER, 3.1 Epicentral Area of January 31, 1986 No activity was detected in this area by either the John Carroll University network or CEI Net.
Close cooperation between CEI and John Carroll University continues.
3.2 Injection Wells - January, 1986 Epicenter Corridor Three microearthquakes were detected and located during the quarter within the corridor.
Their coda magnitudes are respectively.
-0.1,
-0.6,
-0.7, based on average durations of 5, 3, and 2 seconds. Only the first event, on August 15, triggered AUTOSTAR: the second one was 1616J e 1e Weston Geophysical
visible on some of AUTOSTAR's analog records and MEQ-800 records, all vertical components:
the third event was recorded only on three MEQ-800's at a time when AUTOSTAR's helicorders were being serviced.
The last extremely small event is not well recorded and has a somewhat unstable solution.
Figure 2 shows the locations of the three microevents of this quarter.
Figure 3 presents the upiated seismicity recorded since January 31, 1986 between longitudes 81.0W and 81.5W.
Table 1 gives location parameters of all events in or near the corridor.
3.3 Other Events Recorded by AUTOSTAR During the last quarter, AUTOSTAR recorded local quarry blasts, all originating outside its aperture.
It also triggered on several of the larger af tershocks of the July 13, 1986 Ashtabula earthquakes.
These data files have not been examined or analyzed.
4.0 DISCUSSIONS The microearthquakes recorded in the wells-main shock corridor are extremely small, judging by their durations.
It is not clear, at this
..c. apolacion of the coda magnitude time, how valid is the downward formula currently used:
M = 2.D m n c
where D is duration in seconds.
- N. distances, it is qttite I
conservative compared to other relations.+.
The AUTOSTAR digital
- data, particularly when examining the two horizontal components, is superior to the single vertical analog records produced by MEQ-800s.
The comparison of both types confirms the difficulty in identifying the S-phase from MEQ-800 vertical I
seismograms.
This is particularly true when the S-p interval is on the 1616J
- 2*
Weston Geophysical
order of one second.
For this reason, CEI anticipates collecting more reliable hypocenters obtained from AUTOSTAR data before evaluating the spatial distribution of the activity.
All events previously tabulated are totally or partly based MEQ-800 data.
5.0 CONCLUSION
S During the last quarter, from July 16 to October 15, the seismicity in the corridor has been very low, encompassing only three small events with negative magnitudes.
No relationship between well operation and occurrence of microseismicity has yet been established.
AUTOSTAR has been declared fully operational during the period and the digital files from this system are of excellent quality even for small events.
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Weston Geophys col
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TASLE 1 MICR 0E AR THQUAK ES IN THE INJECTION WELLS - MAIN SHOCK CORRIDOR i
YEAR MD DY HRMISEC LAT.N LONG.W D
RMS EH EZ NP NS GAP MC SO 1986 03 12 035525.6 41.[7272 81.1707 2.0 0.06 0.7 0.4 10 6
216
.3 GS 1S86 09 28 103604.2 41.7247 81.1091 2.3 0.04 0.3 0.4 11 6
174
.3 WG l
1586 10 20 105944.7 41.Jf S7 81.1453 3.0 0.07 1.7 2.0 6
4 337
.6 WG IS86 10 27 122555.5 41.7435 81.0944 2.9 0.07 2.7 1.5 6
3 221
.2 WG
]
1986 11 03 035449.6
- 41. 7C 98 81.1292 1.8 0.06 0.5 0.5 7
5 145
.3 WG j
1536 12 01 050317.5 41.7120 31.1195 2.1 0.07 0.6 5.8 7
5 138
.2 WG 1586 12 24 C93733.9 41.7487 81.2392 1.0 0.04 8.5 6.7 6
3 306
.3 WG IS$7 0102 024114.8 41.7472 81.1027 2.0 0.06 0.3 0.5 10 6
174
.6 WG 1987 01 28 235829.8 41.7299 81.0974 2.1 0.03 0.4 0.7 8
5 199
.7 WG 1987 02 23 114556.4 41.7284 81.1197 2.0 0.03 0.1 0.3 10 7
100
.5 WG 1987 02 28 204644.5 41.7451 81.0932 2.4 0.07 1.0 1.7 7
4 239
.4 VG 1987 05 01 211332.3 41.7466 81.0872 1.9 0.06
- 0. 3 0.2 7
4 196
.6 WG 1987 05 01 211352.1 41.7466 31.0921 2.4 0.08 0.2 0.8 15 9
100 1.3 WG 1987 05 02 183307.7 41.7475 81.0932 2.0 0.02 0.1 3.0 6
4 174
.6 WG j
1S87 05 02 202526.5 41.J4 24 S1.0389 2.7 0.08 0.3 0.6 14 8
115 4
WG 1987 07 08 034835.2 41.7292 81.1037 2.7 0.07 0.7 1.1 8
5 166
.2 WG 1987 08 15 052637.7 41.,6594 81.1472 2.8 0.06 0.2 1,0 10 6
133
.1 WG ISS7 10 10 000610.4 41.7430 31.1030 1.9 0.04 0.3 0.2 7
5 166
.6 WG 1987 10 14 195924.8 41.7250 81.1318 3.4 0.04
- 1. 6 0.7 6
3 190
.7 WG S
Q REVISED 10-15-87 8
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January 31,1986 SElSMICITY FOR THE PERIOD 0
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ILLUMIN ATING COWP ANY
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CUMULATIVE SEISMICITY 0
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Figure 3 0
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j APPENDIX 1 CALHlO INJECTION WELL DAT A Weston Geophysical
CAL'nIO INJECTION WELL DATA Two deep injection wells operated by CALHIO Chemicals. Inc., are located in the corridor between the Perry Nuclear Power Plant and the January 31, 1986 epicentral region.
Both wells are used for disposal of waste products from the manufacture of agricultural fungicide.
The operator of these two wells (CALHIO] has provided CRI with daily injection volumes, as reported to the Ohio Environmental Protection Agency.
Daily injection volume records for 19 months, from March 1986 through September 1987, were collected and examined for correlation with seismic activity.
Data from the CALHIO wells, plotted in Figures Al and A2, show a fairly regular pattern of daily injection volumes.
Increases in injection volume occur during periods of heavy or prolonged rainfall.
i.e. June 1986 and June-July 1987.
Hiatuses in injection lasting from two to fourteen days occur when wells are shut down for filter replacement.
Fro:n July through September 1986. Well #1 underwent regular maintenance and testing. During this time Well #2 was used for injection.
Seismicity, as shown in Figures Al and A2. is varied in both magnitude and frequency.
Seventeen events during the nineteen months range in magnitude f rom -0.7 to 1. 3.
Injection data for the entire quarter is not yet available.
Figure Al shows a lack of observable seismicity from April through September 1986.
The events which show a magnitude of less than 0.0 represent extremely small releases of energy and are therefore located with less confidence.
The available data presented in this report show no apparent correlation between seismicity and fluid injection.
The temporal paucity of events and the uncertainties associated with the smaller events preclude a detailed mathematical correlation at this time.
Further analysis using data acquired from the new digital network is necessary to accurately assess any possible correlation between seismi:::ity and fluid injection.
1616J e 4e l
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