Seismo-Watch

Special Earthquake Report No: 00-006

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Preliminary Magnitude:

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Greenwich Mean Date:
Greenwich Mean Time:
Latitude:
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IMPERIAL VALLEY, SOUTHERN CALIFORNIA

ML 4.5 (SCSN)

Mw n/a ( -- )

00/06/14
22:32:07
39.39N
123.07W
7 km
A

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(Imperial Valley M4.5 & M4.2)

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An earthquake registering a preliminary magnitude of ML 4.5 was detected at 21:49:18 UTC, June 14 (2:49 p.m., June 14 PDT), 2000 in the Imperial Valley of southern-most Southern California. The focal point was placed at the shallow depth of 1.0 km and we do not have a fault plane solution for this event as of yet.
 
The quake was centered about 6 miles south-southeast of Brawley and 7 miles north of El Central near the town of Imperial. The quake was widely felt in the region and as far away as Palm Springs in Coachella Valley. Although there have been no reports at this time, it was probably strong enough to topple light items from tables and shelves.
 
UPDATE: Wal-Mart and the Imperial Valley Press in El Centro have reported no toppled items but unconfirmed reports indicate some items toppled in Brawley and Westmoreland.
 
The quake was part of a brisk aftershock sequence which essentially began with a M4.2 event at 12:00 noon and has since included dozens of M2's and at least ten M3's. Many of these events have been felt as well. The main jolt triggered very close to the epicenter of a M4.0 event on March 26.
 
The Imperial and Mexicali Valleys to the Colorado Delta has been rocked by six M4's this year alone. Large M6+ quakes have struck the Imperial Valley several times this century, most notably in 1940 (M6.7), 1942 (M6.5) 1968 (M6.4), 1979 (M6.6), 1987 (M6.5 & M6.2).
 

Update: 4:00 p.m., June 14, 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.
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