This is a preliminary UCB moment tensor solution for the event located 60 km W of Petrolia, CA; 40.385N 124.986W; Z=10.3km; ML=4.5; (USGS/UCB Joint Notification System) on May 9, 2007 at 8:07:32 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsus/Quakes/nc51181706.php Reviewed by: HELLWEG UCB Seismological Laboratory Inversion method: complete waveform Stations used: GASB HATC HUMO JCC ORV WDC YBH Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 6.39E+22 Dyne-cm Mw = 4.47 Z = 14 Plane Strike Rake Dip NP1 99 172 83 NP2 190 7 82 Principal Axes: Axis Value Plunge Azimuth T 6.390 11 54 N 0.000 79 238 P -6.390 1 145 Event Date/Time: May 9, 2007 at 8:07:32 UTC Event ID: nc51181706 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -2.151 Mxy 5.940 Mxz 0.732 Myy 1.936 Myz 0.897 Mzz 0.215 ------- ------------####### ---------------########## ----------------############# ------------------############ ------------------############# T # -------------------############# ## -------------------#################### -------------------#################### -------------------###################### ####---------------###################### ############-------###################### ##################----################### ##################----------------------- #################---------------------- #################---------------------- ###############---------------------- ##############--------------------- #############-------------------- ###########-------------- - #########-------------- P ######------------- ------- Lower Hemisphere Equiangle Projection