PRELIMINARY EARTHQUAKE REPORT
Rapid Earthquake Location Service
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California

Version 2: Updates lower and earlier versions of this earthquake report

A LIGHT EARTHQUAKE OCCURRED AT 05:40 PM PDT Monday, May 21, 2001.
THE MAGNITUDE 4.1 (ML) EVENT IS LOCATED  30 MILES WNW OF PUNTA GORDA, CA
THE HYPOCENTRAL DEPTH IS   9.8 MILES.

This event has been reviewed by Hal Macbeth -USGS NCSN.

PRINCIPAL EARTHQUAKE PARAMETERS
_______________________________

Magnitude              : 4.07  ML
Event Date & Time      : 05/21/2001   05:40:39 PM PDT
05/22/2001   00:40:39    UTC
Location               : 40.4628 N, 124.8633 W
            : (40 deg. 27.77 min. N, 124 deg. 51.80 min. W)
Depth                  :   15.7 km. deep (   9.8 miles)
Location Quality       : Fair

48 km ( 30 miles) WNW (298 degrees) of Punta Gorda, CA
51 km ( 32 miles) WNW (288 degrees) of Petrolia, CA
52 km ( 32 miles) WSW (256 degrees) of Ferndale, CA
62 km ( 38 miles) WSW (256 degrees) of Fortuna, CA
64 km ( 40 miles) W   (267 degrees) of Rio Dell, CA
70 km ( 44 miles) WSW (238 degrees) of Eureka, CA

ADDITIONAL EARTHQUAKE PARAMETERS
________________________________

number of phases             : 130
rms misfit                   :   0.16 seconds
horizontal location error    :   0.7  km
vertical location error      :   0.9  km
maximum azimuthal gap        : 242    degrees
distance to nearest station  :  45.   km
event ID:   40123127


EDIS-05-21-01 1759 PDT


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