(Ml 4.0) CALTECH/USGS EARTHQUAKE MESSAGE

[quake-large-owner@eqinfo.wr.usgs.gov]

                     == PRELIMINARY EARTHQUAKE REPORT ==

                    California Integrated Seismic Network
                           http://www.cisn.org
                      USGS/Caltech/CGS/UCB/UCSD/UNR

Version 1: This report supersedes any earlier reports about this event.

This is a computer-generated message and has not yet been reviewed by a
seismologist.

PRINCIPAL EARTHQUAKE PARAMETERS
_______________________________


Magnitude              : 4.0  Ml (A light quake)
Event Date & Time      :  4/12/2005   04:06:46 AM PDT
                          4/12/2005   11:06:46    UTC
Coordinates            : 32.7258 N, 116.8227 W
                       : (32 deg. 43.55 min. N,  116 deg. 49.36 min. W)
Depth                  :   12.4 miles (  19.8 km)
Location Quality       : Excellent
  9 mi. ( 14 km) ESE of El Cajon, CA
 19 mi. ( 31 km) E   of San Diego, CA
  6 mi. ( 10 km) ESE of SYS-CPE (quarry)

More Information about this event and other earthquakes is available at
http://quake.wr.usgs.gov/recenteqs/latestfault.htm

ADDITIONAL EARTHQUAKE PARAMETERS
________________________________
rms misfit                   :  0.22 seconds
horizontal location error    :   0.6 km
vertical location error      :   0.7 km
maximum azimuthal gap        :   109 degrees
distance to nearest station  :  11.0 km
event ID                     : 14137160

SOURCE OF INFORMATION/CONTACTS
________________________________

CISN Southern California Management Center

         Caltech Seismological Laboratory
         U.S. Geological Survey

         http://www.cisn.org/scmc.html

________________________________

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