This is a preliminary UCB moment tensor solution for the event located 7 km E of the Geysers, CA (38.797N 122.728W; Z=4.1km; ML=3.6; USGS/UCB Joint Notification System) on May 9, 2002 at 11:07:55 UTC. Other information about this event can be viewed at: http://ncedc.org/recenteqs/Quakes/nc40133275.html Reviewed by: Dreger UCB Seismological Laboratory Inversion method: complete waveform Stations used: BDM BKS JCC ORV POTR Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 8.11E+21 Dyne-cm Mw = 3.91 Z = 5 km Plane Strike Rake Dip NP1 40 -52 68 NP2 155 -147 43 Principal Axes: Axis Value Plunge Azimuth T 8.110 15 103 N 0.000 35 203 P -8.110 51 354 Event Date/Time: May 9, 2002 at 11:07:55 UTC Event ID: nc40133275 Moment Tensor: Scale = 10**21 Dyne-cm Component Value Mxx -2.766 Mxy -1.294 Mxz -4.378 Myy 7.173 Myz 2.382 Mzz -4.406 ------- #------------------ ###---------------------- ####-----------------------## #####------------------------#### ######--------- ------------##### ######---------- P -----------####### #######---------- ----------######### #######----------------------########## ########---------------------############ #########-------------------############# #########------------------############## ##########---------------########### ## ##########--------------############ T ## ##########-----------############## # ###########--------#################### ############----##################### ############-###################### ##########---#################### ####---------################ --------------########### -----------------## -------