Seismo-Watch

Special Earthquake Report No: 00-001

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NORTHERN CALIFORNIA COAST RANGE

ML 4.4 (NCSN)

Mw 4.4 (UCBSL)

00/01/10
21:41:27
38.76N
122.91W
6.2 km
A

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Seismo-Watch has received information that "an earthquake registering a preliminary magnitude of ML 4.4, Mw 4.4 was detected at 21:41:27 UTC (1:41 p.m. PST), January 10, 2000, north of San Francisco in Northern California.
 
The quake was centered about 6 miles southeast of Cloverdale and about 10 miles northwest of Healdsburg in Alexander Valley near the small town of Asti. It was centered along the Maacama Fault between Crocker and Gill Creeks and not far from a small swarm that occurred in mid December.
 
The focal point was placed at depth of 6.2 km and the fault plane solution by the University of California, Berkeley, Seismological Laboratory, suggested strike-slip motion along a northwest trending plane with a slight oblique component. The quake was followed by a fairly brisk aftershock sequence which has consisted 17 quakes registering M1.0 or stronger, two of which measured in the mid M2 range, within the first 4.5 hours.
 
The quake was widely felt in the region (Ukiah to San Pablo Bay and parts of the western Sacramento Valley), causing hanging plants to swing, windows to rattle and glassware to tinkle, but there have been no reports of items toppling from tables of shelves. Many thought the quake occurred in The Geysers geothermal area which constantly produces events in the M1-M2 range and occasional quakes in the M3 and sometimes in the range.
 
It was the largest earthquake in the northern California Coast Range since a M4.4 event near Covelo on November 11. Many North Coast residents will probably remember the Sonoma Mountain M4.2 on September 22 and, of course, the Bolinas M5.0 earthquake on August 16 - the same day as the devastating Western Turkey M7.4 earthquake which killed more than 15,000 people."

Update: 5:00 p.m., January 10, 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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