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┌─────────────────────────────────────────────────────────────────────────────┐
│▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒ California Division of Mines & Geology ONLINE ▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒│
└─────────────────────────────────────────────────────────────────────────────┘
September 8, 1994
Weekly Earthquake Report for Southern California
------------------------------------------------
September 1 - 7, 1994
Prepared by: Kate Hutton, Seismological Laboratory
(kate@bombay.gps.caltech.edu)
Lucy Jones, U.S. Geological Survey
California Institute of Technology
This document is a commentary on current seismic activity. The
earthquakes discussed have been detected and processed
automatically. All epicenters and magnitudes have been reviewed
to exclude obvious blunders; however, they must still be
considered preliminary. 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, September 1, Pacific Daylight Time, to midnight Wednesday
night, September 7, Pacific Daylight Time. We recorded 338
earthquakes this week.
Both of the quakes that were felt this week were
Northridge aftershocks: a M2.7 on Monday afternoon, near San
Fernando, and a a M2.7 late Tuesday afternoon, near Canoga Park.
No aftershocks, to the Northridge or to the Landers earthquakes,
were above M3.0.
There were two M3+ events in the Coalinga/Parkfield area,
on Tuesday morning (M3.1) and on Wednesday afternoon (M3.0).
If you need further information on these quakes, see the
Northern California Earthquake Report or contact the U.S.
Geological Survey in Menlo Park (415-864-8300). Another event of
interest, a M4.1 southwest of Modesto on Wednesday, occurred in
the Menlo Park coverage area.
There were 16 more events in the on-going Fontana swarm,
but the largest was M2.0. None of them were apparently felt.
The table lists the quakes 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 Daylight
Time listed.
Table 1
-------
Date Time N Lat. W Long. Mag
-------------------------------------------------------------
9/1 3:24 am 34 1.9 117 30.3 2.0 Fontana, 3 mi. SE of the
I10/I15 interchange
9/1 8:31 am 34 13.0 118 39.0 2.7 2 mi. WNW of Canoga Park
9/1 9:07 am 34 50.0 116 18.8 2.0 32 mi. SSW of Baker
9/1 9:39 am 34 19.3 116 25.5 2.0 14 mi. N of Yucca Valley
9/1 3:33 pm 34 23.9 116 27.8 2.2 19 mi. N of Yucca Valley
9/2 1:59 am 34 6.8 117 26.6 2.0 Under Fontana
9/2 2:57 am 34 2.5 117 30.7 2.0 Fontana, 2 mi. SE of the
I10/I15 interchange
9/2 5:32 am 34 12.9 118 38.4 2.0 2 mi. WNW of Canoga Park
9/2 5:49 am 34 2.6 117 30.6 2.0 Fontana, 2 mi. SE of the
I10/I15 interchange
9/2 7:35 am 34 15.6 118 28.3 2.0 2 mi. SW of San Fernando
9/2 7:49 am 34 20.5 116 28.5 2.0 15 mi. N of Yucca Valley
9/2 10:00 am 34 13.2 118 38.8 2.1 2 mi. WNW of Canoga Park
9/2 2:31 pm 34 18.9 118 45.9 2.0 4 mi. NW of Simi Valley
9/2 7:26 pm 34 8.4 116 25.5 2.3 1 mi. NE of Yucca Valley
9/3 12:00 am 34 9.0 116 25.8 2.5 2 mi. NNE of Yucca Valley
9/3 3:00 am 35 48.5 117 57.4 2.0 16 mi. S of Coso Junction
9/3 7:25 am 34 32.8 118 51.2 2.0 11 mi. NNE of Fillmore
9/3 8:57 am 34 55.4 116 33.9 2.0 26 mi. E of Barstow
9/3 10:06 am 34 55.4 116 32.7 2.0 "
9/3 2:27 pm 33 20.9 116 20.9 2.2 6 mi. NNE of Borrego Springs
9/3 2:52 pm 34 35.2 116 35.3 2.0 22 mi. ENE of Lucerne Valley
9/3 4:29 pm 32 39.1 115 53.8 2.2 8 mi. SE of Ocotillo
9/3 6:52 pm 34 18.6 116 26.4 2.1 13 mi. N of Yucca Valley
9/4 1:33 am 34 0.7 117 6.4 2.2 4 mi. SE of Redlands
9/4 2:12 am 34 32.5 116 32.0 2.0 26 mi. NE of Big Bear City
9/4 8:33 am 35 29.5 118 26.9 2.0 10 mi. S of the town of
Lake Isabella
9/4 9:57 am 34 16.7 116 42.1 2.2 8 mi. E of Big Bear City
9/4 12:43 pm 35 7.4 116 40.5 2.3 19 mi. SE of Goldstone (dry)
Lake
9/4 1:26 pm 34 19.9 118 28.8 2.0 4 mi. NW of San Fernando
9/4 1:26 pm 34 19.9 118 28.9 2.3 "
9/5 2:32 am 34 18.2 118 27.5 2.5 1 mi. NW of San Fernando
9/5 7:59 am 33 58.6 116 19.1 2.1 10 mi. E of Desert Hot
Springs
9/5 9:59 am 34 41.6 119 17.2 2.1 17 mi. N of Ojai
9/5 1:27 pm 34 18.4 118 25.5 2.6 1 mi. NNE of San Fernando
FELT
9/5 4:40 pm 34 58.9 116 56.7 2.2 7 mi. NE of Barstow
9/5 8:12 pm 34 7.7 116 54.3 2.0 4 mi. WNW of Mt. San
Gorgonio
9/6 7:02 am 32 47.2 115 26.8 2.4 6 mi. E of El Centro
9/6 7:51 am 32 45.7 118 23.0 2.9 4 mi. SSW of San Clemente Is.
9/6 8:29 am 36 9.2 120 30.2 3.1 8 mi. WNW of Coalinga
9/6 9:55 am 32 47.0 115 26.6 2.2 6 mi. E of El Centro
9/6 10:04 am 34 2.8 117 30.6 2.0 Fontana, 2 mi. SE of the
I10/I15 interchange
9/6 5:45 pm 34 12.7 118 38.5 2.7 2 mi. WNW of Canoga Park
FELT
9/6 9:38 pm 34 16.4 118 27.2 2.2 1 mi. WSW of San Fernando
9/6 10:01 pm 34 43.0 116 5.3 2.3 37 mi. S of Baker
9/7 2:41 am 34 22.1 116 28.1 2.1 17 mi. N of Yucca Valley
9/7 2:08 pm 35 2.3 116 59.9 2.8 10 mi. N of Barstow
9/7 3:34 pm 35 59.5 120 33.5 3.0 9 mi. NW of Parkfield
9/7 10:01 pm 33 57.2 116 23.7 2.1 6 mi. E of Desert Hot
Springs
9/7 10:35 pm 34 15.8 118 34.5 2.0 3 mi. NW of Northridge
-------------------------------------------------------------
Figure 1. A map of southern California showing the earthquakes
recorded during the past week by the Caltech/USGS Seismic
Network. Major faults are marked, as well as the metropolitan
areas of Los Angeles (L.A.), Palm Springs (P.S.), San Diego
(S.D.), and Santa Barbara (S.B.). The circles denote the
earthquakes, the size of the circle indicating the magnitude.
-------------------------------------------------------------
CDMG ONLINE
California Division of Mines and Geology
Computer Bulletin Board System
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