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CD-ROM Aktief 1995 #3
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ct021595.txt
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1995-02-21
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February 16, 1995
Weekly Earthquake Report for Southern California
------------------------------------------------
February 9 - 15, 1995
Prepared by: Kate Hutton, Seismological Laboratory
(kate@bombay.gps.caltech.edu)
Lucy Jones, U.S. Geological Survey
California Institute of Technology
For further information, please contact the authors or the Caltech
Public Relations Office at 818-395-6326. For daily updates, call
our Earthquake Information Hotline: 818-395-6977.
--------------------------------
This week's Report covers the time period from midnight Thursday
morning, February 9, Pacific Standard Time, to midnight
Wednesday night, February 15, 1995, Pacific Standard Time. We
recorded 263 earthquakes of M1.0 or larger during the 7-day period
covered.
Just about the only excitement this week was caused by
the two "Valentine's Day earthquakes" on Tuesday night. Both
were aftershocks of the Northridge earthquake, and both were close
to Granada Hills, although not at the same location. The first
and largest was a M3.2 at 6:54 pm, and the second was a M2.7 at
12:40 the next morning. There was initially some confusion with
the 6:54 pm quake, since our automatic location software failed
to locate it properly and, due to the poor location, failed to
notify the duty seismologist. Also possibly because of the poor
location, the magnitude was underestimated at M2.9. Other things
besides quakes can affect our signals, including electronic problems,
wind, and what we call "cultural noise" like traffic, etc. Because
of these problems, one percent or so of the quakes have problems in
the automatic locator. We are continually trying to improve the
percentages, but it's something to watch for if you are a user of
"finger quake@scec.gps.caltech.edu". In the case of the Granada
Hills quake, we had improved information going out within a half
hour.
Procedures went much more smoothly with the 12:40 am quake,
although sometimes we wish folks would wait until 8 am to call about
quakes that tiny!
Speaking of tiny, we got one call about a M2.2 near Simi
Valley on Sunday night. We don't know whether to believe it was
truly felt or just a coincidence that someone called at the right
time.
The table lists the quakes this week that were M2.0 or
larger in the central part of the coverage area. Times are local
times; if you want Greenwich Mean Time, add 7 hrs to the Pacific
Daylight Time or 8 hrs to the Pacific Standard Time listed.
Table 1
-------
Date Time N Lat. W Long. Mag
-------------------------------------------------------------
2/9 2:30 am 36 28.8 120 29.6 3.1 24 mi. NNW of Coalinga
2/9 5:18 am 34 38.1 116 33.2 2.1 25 mi. ENE of Lucerne Valley
2/9 7:38 am 34 16.4 118 22.7 2.3 3 mi. E of San Fernando
2/9 9:58 pm 36 0.2 119 22.5 2.3 22 mi. SSW of Visalia
2/10 2:02 am 32 34.1 117 59.5 2.2 26 mi. SE of San Clemente Is.
2/10 4:53 am 34 2.9 117 16.9 2.3 1 mi. SE of the I10/I215
interchange/Loma Linda
2/10 11:48 am 34 24.7 116 28.6 2.1 20 mi. N of Yucca Valley
2/10 12:28 pm 33 14.9 116 21.9 2.2 Under Borrego Springs
2/10 5:46 pm 35 4.5 118 23.8 2.2 4 mi. SE of Tehachapi
2/11 7:00 am 35 33.2 118 54.3 2.0 12 mi. NNE of downtown
Bakersfield
2/11 7:14 am 33 18.8 117 52.7 2.0 16 mi. SSW of Laguna Beach
2/11 12:46 pm 35 55.8 117 40.0 2.3 17 mi. ESE of Coso Junction
2/12 2:02 am 33 20.6 116 47.3 2.1 4 mi. E of Palomar
Observatory
2/12 2:36 am 36 24.8 120 21.8 2.7 19 mi. N of Coalinga
2/12 6:00 am 34 8.7 116 25.4 2.1 2 mi. NE of Yucca Valley
2/12 6:29 am 32 48.4 116 8.8 2.3 10 mi. WNW of Ocotillo
2/12 6:35 pm 35 50.5 118 19.6 2.1 16 mi. NNE of the town of
Lake Isabella
2/12 8:42 pm 34 21.4 118 41.3 2.2 5 mi. NNE of Simi Valley
FELT?
2/12 8:43 pm 34 38.8 116 31.8 2.5 27 mi. ENE of Lucerne Valley
2/13 6:00 am 34 23.9 116 27.3 2.4 19 mi. N of Yucca Valley
2/13 2:02 pm 35 12.0 120 49.8 2.8 11 mi. S of Morro Bay
2/13 2:37 pm 35 50.5 118 19.6 2.8 16 mi. NNE of the town of
Lake Isabella
2/13 4:14 pm 34 17.6 118 27.2 2.0 1 mi. NW of San Fernando
2/13 5:22 pm 32 48.9 118 18.0 2.1 2 mi. E of San Clemente Is.
2/14 1:48 am 34 54.8 116 55.7 2.2 5 mi. ENE of Barstow
2/14 6:09 am 35 31.6 118 15.1 2.5 14 mi. ESE of the town of
Lake Isabella
2/14 7:25 am 36 11.7 118 18.3 2.6 17 mi. WSW of Olancha
2/14 3:08 pm 35 12.1 120 52.9 2.4 11 mi. S of Morro Bay
2/14 6:54 pm 34 15.2 118 28.8 3.2 2 mi. SE of Granada Hills
FELT
2/15 12:40 am 34 15.0 118 30.4 2.7 1 mi. S of Granada Hills
FELT
2/15 4:48 am 36 23.1 117 58.7 2.1 7 mi. NNE of Olancha
2/15 7:38 am 34 34.1 116 35.6 2.1 21 mi. ENE of Lucerne Valley
2/15 10:05 am 36 59.4 117 34.8 2.2 35 mi. NW of Stovepipe Wells
2/15 5:10 pm 34 7.2 116 23.9 2.1 2 mi. E of Yucca Valley
2/15 10:33 pm 33 52.0 118 16.5 2.0 Near the I110/I405
interchange
-------------------------------------------------------------