Seismo-Watch

Special Earthquake Report No: 99-003

Preliminary data indicates a significant earthquake has occurred:

Regional Location:

Preliminary Magnitude:

Moment Magnitude:

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

NORTHERN CALIFORNIA

4.0 ML (NCSN)

4.1 Mw (UC Berkeley)

99/01/24
15:34:56 (7:35 a.m. PST)
39.56N
123.77W
4 km
B

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Notations:
An earthquake registering a preliminary magnitude of ML 4.0 (NCSN), Mw 4.1 (UCB) occurred at 15:34:56 UTC (7:35 a.m. PST), January 24, along the Northern California coast. The focal point was placed at 4 km below the surface but the analysis quality is fair and will probably undergo changes as the recorded is reviewed.
 
The quake was centered about 13 miles west northwest of Willits and 8 miles north of Fort Bragg where Ten Mile Creek enters the Pacific Ocean at Mac Kerricher State Park. The epicenter is located on the north side of the inlet about a mile and a half northwest of the small Scenic Shoreline Highway 1 town of Inglenook.
 
The University of California, Berkeley, Seismological Laboratory fault plane solution suggested thrust faulting along a west-northwest trending fault plane, indicating the quake was not centered along a "San Andreas style-fault" but along some other nearby structure.
 
There have been some reports of the temblor being felt at Fort. Bragg but there has been no news of any items toppling from tables and shelves.
 
Did you feel this tremor? .
 
Read a short note by Charles Watson to a earthquake discussion list about the geomorphology of the region HERE.
 
A similar copy of this earthquake report was sent to subscribers of the Seismo-Watch Earthquake Fax Alert Bulletins within hours of the event.

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Subtract 8 hours from Greenwich Mean Time to obtain PST or 5 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)
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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