Seismo-Watch

Special Earthquake Report No: 00-002

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

Greenwich Mean Date:
Greenwich Mean Time:
Latitude:
Longitude:
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NORTHERN CALIFORNIA COAST RANGE

ML 4.3 (NCSN)

Mw 4.3 (UCBSL)

00/01/11
14:19:52
38.77N
122.91W
6.6 km
A

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Seismo-Watch has received information that "an earthquake registering a preliminary magnitude of ML 4.3, Mw 4.3 was detected at 14:19:52 UTC (6:19 a.m. PST), January 11, 2000, north of San Francisco in the northern Coast Range. The quake was centered about 6 miles southeast of Cloverdale and about 10 miles northwest of Healdsburg in Alexander Valley, between Crocker and Gill Creeks near Asti."
 
"The focal point was placed at depth of 6.6 km and the fault plane solution suggested strike-slip motion along a north-south trending plane with a slight oblique component. The fault plane solution suggests the quake did not occur along the Maacama Fault because its dominant orientation of slip is northwest-southeast. Therefore, the quake may have occurred along some nearby or adjacent fracture plane perhaps within the Maacama Fault Zone."
 
"It was the second earthquake in less and 24 hours in this location that measured in the M4 range. Yesterday's M4.4 quake occurred 1:41 p.m. and was followed by 29 aftershocks registering M1.0 or stronger, including a pair in the M2 range. In the short 2.5 hours following this morning's jolt (the time it took to prepare this report), there have been 23 more aftershocks, including nine in the M2 range, the largest of which measured M2.6."
 
"This morning's quake was sharply felt at Cloverdale and Healdsburg where it jarred many people from sleep and knocked a few light items from tables and shelves. It was felt as far away as Sebastopol, Santa Rosa and Napa."
 
"Activity in The Geysers geothermal area, located a few miles to the east and known for abundant microseismicity, has not shown any changes in its daily pattern of activity."

Update: 7:55 a.m., January 11, 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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