ML20033B192
| ML20033B192 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 11/02/1981 |
| From: | Brady G INTERIOR, DEPT. OF, GEOLOGICAL SURVEY |
| To: | Rolonda Jackson NRC |
| Shared Package | |
| ML20033B191 | List: |
| References | |
| NUDOCS 8112010008 | |
| Download: ML20033B192 (5) | |
Text
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UNITED STATES
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DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY
~~
delsmic tngineering or:.,
345 Middlefield Road, Mail
- 78 Menlo Park, California 94025 November 2, 1981 '
MEMORANDUM To:
NRC a A
MA From: Gerald Brady, USGS g,
d Of'the more than 50 triggers'of the acte erographs at Monticello Dam, SC, through 8-4-81, there were 13 that recorded 0.10 g or greater peak acceleration as listed in Table 1.
All 13 records are from the instrument on the shared abutment, between the two laigest sections of the dam. Of these 13 -
records, 4 have been processed and the results published in USGS Open File reports 81-0448 and 81-1214. Numerical data is available from NOAA in Colorado.
~
Seven of the nine remaining records owe their peak reading to a pulse greater then 0.1 g at triggering; the pulse, often the only one greater than 0.1 g, is therefore incompletely recorded.
In my opinion, this is sufficient reason to discard these records as far as processing is concerned.
The two remaining records having the possibility of useful results after processing are amongst the unidentified (S'ee Table 1):
1.
First triggering of the 24-27 Feb 1978 record.
5.
Fif th triggering (of 8) of the 31 Aug-6 Nov 1978 record.
We are currently making preparations for placing these two into our digitizing
, and processing stream.
Copies of these two records are attached.
A word about unidentified records.
In our experience with small events close to recording stations, it is impossible to be certain of an identification based on peak values, record appearance,'and known nearby events. Such is the case for records 1 and 2, and the set 4-8 (See Table 1). The identification of some of the events on the list of Table 1 has been possible because of large events (magnitude 2.5 - 3 is large in this context) and manual observation of additional triggering signals.
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The.only records from the inst'rument at the nuclear plant, described as.
Abutment (Office), occurred early in 1978.
Between 24-27 Feb there were two triggers; between 27 Feb and 16 March,1978 there was one trigger.. All am'plitddes are less than.07 g.
Dur11.; tne same intervals, the instrument i
described asL Abutment (shared crest), (the one supplying the 4 analyzed records to date), had two triggers (between 24-27 Feb, See Table,1) and another two triggers (between 27 Fen and 16 March). Without identification, one can'only guess at the.correspordence or simultaneity, if any, between i
triggers at different stations.
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Table-1 Peak Accelerat. ions 2 0.1 g at Monticello Dam, SC, through 8-4-81)
Scaled peak acceleration l-Recoveredfilmdates,oreventdata 180* Ilp 9ne Trigger I
1.
.15.10.07 24-27 Feb 1978; 2 unidentified events 1 of 2.
2.
.14.06.07 4 of 2 3.
.25.08.20 27.Aug~1978; 1023 UTC; 34.31 N, 81.33 W, M = 2.7 t:
4.
.11
.03.06 31 Aug-6 Nov 1978; 8 unidentified-events b,
1 of 8
- 5.,
.07.03.12 5 of 8 6.
.05.05.09 6 of 8'
~7.
.22.11.16 7 of'8 8.
.13.17.24 8 of 8
- 9. '
.07.06.16 7 Oct 1979; 0854 U'TC 2 of 10
- 10..
.04.06.10 8 Oct 1979; 2320 UTC; 34' 18.11', 81'20.42' ; M = 2.6 5 of 10 11.
.10.03.07 14 Oct 1979, 0824 UTC; 34'18.35' N, 81'20.29' W; M = 2.5 8 of 10 12.
.08.05.11 14 Oct 1979; 1206 UTC; 34'18.43' N, 81'19.91' W; M = 2.3~
9 of'10
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34'16.67' N, 81 19.76' W; M = 2.8 8
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