This is a preliminary UCB moment tensor solution for the event located 25 km W of Petrolia, CA; 40.3178N 124.5837W; Z=17.120km; ML=3.7; (USGS/UCB Joint Notification System) on July 4, 2003 at 20:52:57.27 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsUS/Quakes/nc51129636.htm Reviewed by: Lind Gee UCB Seismological Laboratory Inversion method: complete waveform Stations used: HUMO JCC ORV WDC Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 3.69E+22 Dyne-cm Mw = 4.34 Z = 21 km Plane Strike Rake Dip NP1 189 14 88 NP2 99 178 76 Principal Axes: Axis Value Plunge Azimuth T 3.690 11 55 N 0.000 76 197 P -3.690 8 323 Event Date/Time: July 4, 2003 at 20:52:57.27 UTC Event ID: nc51129636 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -1.107 Mxy 3.412 Mxz -0.016 Myy 1.045 Myz 0.899 Mzz 0.062 ------- ------------####### ------------########## -- P ------------############ ---- -----------############ -------------------############ T # --------------------############ ## --------------------################### --------------------################### ---------------------#################### ##------------------##################### #######-------------##################### #############-------##################### ###################-----#############---- ##################--------------------- ##################--------------------- #################-------------------- ###############-------------------- ##############------------------- ############----------------- ##########--------------- ######------------- -------