Seismo-Watch

Special Earthquake Report No: 99-024

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LAVIC LAKE (HECTOR) AFTERSHOCK ZONE

ML 5.1 (SCEC)

Mw n/a ( -- )

99/10/21
01:57:39
34.86N
116.40W
6.0 km
A

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The robust aftershock sequence following the Saturday, October 16, Lavic Lake (Hector) M7.1 earthquake continues.
 
While aftershocks have been occurring at a feverous pace, a new sequence began this evening at 6:25 p.m PDT, October 20 (01:25:47 UTC, October 21) with a M4.3 temblor. It was followed by several events within the next half hour when a ML 5.1 temblor occurred at 6:54 p.m PDT. It was three minutes later (6:57 a.m.) when a second jolt registering M5.1 occurred.
 
The activity was centered in the extreme northern portion of the aftershock zone about 5 miles north of Highway 40 and about 10 miles north of Lavic (Dry) Lake along the western flank of the Cady Mountains.
 
The two main jolts were sharply felt in the epicentral area and as far away as Los Angeles. Windows rattled and some items were knocked from tables and shelves in Barstow and Victorville. It was the first M5+ activity in the Lavic Lake aftershock since the day of the main shock.
 

Update: 9:00 p.m., October 20, 1999.

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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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