Special Earthquake Report No: 01-005

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ML 5.1 (SCSN)

Mw n/a ( -- )

21:05:05 (01:05:05 p.m. PST)
5.9 km

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(Big Bear M5.1 Maps)





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BIG BEAR, CALIFORNIA, February 10, 2001 (Seismo-Watch) -- Preliminary data indicates that a moderate earthquake measuring Ml 5.1 occurred at 21:05 UTC (1:05 p.m. local time) east of Los Angeles in the San Bernardino Mountains, near Big Bear. (See Seismo-Watch EQ Alert Bulletin / Subscription info)
The quake was centered at a depth of 5.9 km beneath the north shore of Big Bear Lake near the small town of Fawnskin (Maps). We do not have a fault plane solution for the event as of yet. Faulting in the San Bernardino Mountains is complex and it is not known at this time which fault produced this quake.
The the main M5.1 shock was widely felt in the region and as far away as Los Angeles, Oceanside, Ridgecrest and La Quinta. Reports from the epicentral area indicate items were tossed from tables and shelves, pictures were knocked from walls and cabinet drawers opened, but there has been no word of any windows breaking of plaster cracking at this time. Many people were frightened and some ran for cover or bolted outside.
Residents in outlying areas said windows jiggled, glassware tinkled and hanging plants swung.
The quake was precede by a few foreshocks earlier in the morning, including one as large as M2.9. Many residents in the Coachella Valley area also felt a M3.9 temblor at 9:50 a.m. but this quake was located in the Little San Bernardino Mountains about 9 miles north-northeast of Indio and several miles east of the Big Bear quake.
Nearly three dozen aftershocks have been recorded in the first few hours, including two M3s and one as large as M4.2 at 4:39 p.m. ? It was locally felt, startling many people but did not cause any items to topple from tables or shelves.
It was the first earthquake in the M5+ range in Southern California in more than two years and since a M5.1 to the Lavic Lake (Hector Mine) aftershock on October 22, 1999. See a list of M5s in Southern California since 1983.
Earthquake in Southern California has been declining during the recent months, mostly due the waning of the Lavic Lake aftershock sequence. The week of February 1-7 was one of the quietest in near 2.5 years and the month prior to the Lavic Lake earthquake.
The San Bernardino Mountains were rocked with a M6.6 earthquake on June 28, 1992 which came just 4 minutes following the powerful Landers M7.3 earthquake located along the eastern flank of the San Bernardino Mountains. The last earthquake to registering M6+ in Southern California was the Lavic Lake (Hector Mine) M7.1 earthquake which was centered in a remote region of the High Desert north of Twentynine Palms on October 16, 1999.
More information will be added shortly.
Additional Resources: (Sites will appear as pop-up windows)
TriNET Recent Earthquakes Page for Inland Empire, SCA.
USGS - Did You Feel It?.
USGS - Pasadena Office, Southern California.
Southern California Earthquake Data Center.
Southern California Earthquake Center.
Caltech Seismological Laboratory.



Sources: USGS, Caltech, personal communications.
Update: 2:10 p.m., February 10, 2001.
Information contained within this report may not be disseminated without prior written consent from Seismo-Watch, Inc.
Copyright (c) Advanced Geologic Exploration 2001

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Subtract 8 hours from Greenwich Mean Time to obtain PST or 4 hours for EDT
Location Quality: A (good), B (fair), C (poor), D (bad)
Magnitude: Ml (local or Richter magnitude), Lg (mblg), Md (duration), Mb (body wave), Ms (surface wave), Mw (moment)

Standard Sources Include:
U.S. Geological Survey, National Earthquake Information Center, Golden, CO (NEIC)
Harvard Geophysical Observatory, Harvard University, Cambridge, MA (HRV)
U.S. Geological Survey, Northern California Seismic Network (NCSN)
University of California, Berkeley, Seismological Laboratory (UCBSL)
Southern California Seismic Network (USGS & Caltech), Pasadena, California (SCSN)
California Institute of Technology, Pasadena, California (Caltech)
various wire reports and/or personal communications

All data are preliminary and subject to change.
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