== 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

This event has been reviewed by Steve Walter

A LIGHT EARTHQUAKE OCCURRED AT 04:16 AM PST Friday, Dec 04, 1998.
THE MAGNITUDE 4.1 (ML) EVENT IS LOCATED   3 MILES ESE OF RICHMOND, CA
THE HYPOCENTRAL DEPTH IS   3.6 MILES.

PRINCIPAL EARTHQUAKE PARAMETERS
_______________________________

Magnitude              : 4.12  ML
Event Date & Time      : 12/04/1998   04:16:07 AM PST
                         12/04/1998   12:16:07    UTC
Location               : 37.9220 N, 122.2885 W
                       : (37 deg. 55.32 min. N, 122 deg. 17.31 min. W)
Depth                  :    5.8 km. deep (   3.6 miles)
Location Quality       : Excellent

  5 km (  3 miles) ESE (108 degrees) of Richmond, CA
  6 km (  4 miles) NNW (345 degrees) of Berkeley, CA
  9 km (  6 miles) S   (175 degrees) of Pinole, CA
 11 km (  7 miles) S   (181 degrees) of Hercules, CA
 11 km (  7 miles) WNW (298 degrees) of Orinda, CA
 20 km ( 12 miles) NE  ( 35 degrees) of San Francisco City Hall, CA

ADDITIONAL EARTHQUAKE PARAMETERS
________________________________

number of phases             : 198
rms misfit                   :   0.10 seconds
horizontal location error    :   0.1  km
vertical location error      :   0.3  km
maximum azimuthal gap        :  43    degrees
distance to nearest station  :   4.   km

In region 2 (016) HAYWARD FAULT
event ID:   40083251
==========================================================================
 
 U.S. Geological Survey                      | Seismological Laboratory
 Earthquake Hazards Team                     | 475 McCone Hall
 345 Middlefield Road - MS 977               | U.C. Berkeley
 Menlo Park, CA 94025                        | Berkeley, CA 94720-4760
 
 Voice           : 650-329-4085              | 510-642-3977
 Earthquake Info : 650-329-4025              | 510-642-2160
 Fax             : 650-329-5163              | 510-643-5811
 E-mail          : ncsn@andreas.wr.usgs.gov  | bdsn@seismo.berkeley.edu
 
 More Information about this event and other earthquakes is available on
 the Worldwide Web at http://quake.wr.usgs.gov

NCSN First Motion Mechanism 1