Seismo-Watch

Special Earthquake Report No: 00-012

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

Greenwich Mean Date:
Greenwich Mean Time:
Latitude:
Longitude:
Focal Depth:
Analysis Quality (A-D):

WHEELER RIDGE AREA, SO. CALIFORNIA

ML 4.4 (SCSN)

Mw n/a ( -- )

00/12/24 (00/12/23 PST)
23:39:14 (5:04 p.m. local time)
34.93N
119.02W
15.1 km (9.4 mi.)
A

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EARTHQUAKE EPICENTER
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(Wheeler Ridge, CA M4.4)

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BAKERSFIELD, CALIFORNIA, December 23, 2000 (Seismo-Watch) -- Preliminary data indicates that an earthquake measuring M4.4 occurred at 5:04 p.m. PST, Saturday, December 23 about 31 miles south of Bakersfield and some 6 miles west of Grapevine along the northern flank of the San Emigdio Mountains (See maps).
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The quake triggered in the Pleito Hills near the mouth of Black Bob Canyon. The focal depth was placed at just under 10 miles beneath the surface and we do not have a fault plane solution at this time.
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It was widely felt in the region, and as far away as the Los Angeles basin, the Santa Barbara coast, Victorville and North Bakersfield. Residents closest to the epicenter, for example in the Frazer Park area, felt the ground tremble but there was no appreciable shaking of walls or windows. There have been no reports of items toppling from tables or shelves.
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It was only the second quake to strike Southern California in the past six months but the fourth in the whole State of California just in December.
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[This report will be expanded shortly]

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Sources: USGS, UCBSL, personal communications.

Update: 10:00 p.m., December 23, 2000.

Information contained within this report may not be disseminated without prior written consent from Advance Geologic Exploration, Inc. and Seismo-Watch.

Copyright (c) Advanced Geologic Exploration 2000

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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.
Copyright ? 1999 Advanced Geologic Exploration, Inc.
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