This is a preliminary UCB moment tensor solution for the event located 25 km W of Petrolia, CA; 40.3107N 124.5778W; Z=18.8km; ML=3.8; (USGS/UCB Joint Notification System) on April 5, 2007 at 22:54:29 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsus/Quakes/nc40195359.php Reviewed by: Guilhem UCB Seismological Laboratory Inversion method: complete waveform Stations used: GASB, JCC, KCT Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 1.93E+22 Dyne-cm Mw = 4.13 Z = 18 Plane Strike Rake Dip NP1 12 18 88 NP2 281 178 72 Principal Axes: Axis Value Plunge Azimuth T 1.930 14 238 N 0.000 72 18 P -1.930 11 145 Event Date/Time: April 5, 2007 at 22:54:29 UTC Event ID: nc40195359 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -0.748 Mxy 1.684 Mxz 0.061 Myy 0.706 Myz -0.595 Mzz 0.042 ------- --------------##### ----------------######### ------------------########### --------------------############# --------------------############### ---------------------################ ---------------------################## ---------------------################## ######################-################## #####################--------############ #####################-------------####### #####################----------------#### ####################--------------------# ###################-------------------- ### ############--------------------- ## T ############-------------------- # ###########-------------------- ##############----------- ----- ############----------- P --- #########------------ - ######------------- ------- Lower Hemisphere Equiangle Projection