This is a preliminary UCB moment tensor solution for the event located 1 km N of the Geysers, CA; 38.810N 122.808W; Z=0.8km; ML=3.8; (USGS/UCB Joint Notification System) on July 20, 2007 at 17:50:20UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsus/Quakes/nc51184307.php Reviewed by: DREGER UCB Seismological Laboratory Inversion method: complete waveform Stations used: BKS CVS MCCM MNRC Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 9.80E+21 Dyne-cm Mw = 3.93 Z = 5 Plane Strike Rake Dip NP1 40 -68 66 NP2 174 -131 32 Principal Axes: Axis Value Plunge Azimuth T 9.800 18 113 N 0.000 20 210 P -9.800 62 344 Event Date/Time: July 20, 2007 at 17:50:20UTC Event ID: nc51184307 Moment Tensor: Scale = 10**21 Dyne-cm Component Value Mxx -0.636 Mxy -2.642 Mxz -5.084 Myy 7.283 Myz 3.794 Mzz -6.648 #------ ####--------------- #####-------------------- ######----------------------# ######-----------------------#### ######------------------------##### #######-----------------------####### #######--------- -----------######### #######--------- P -----------######### #######---------- ----------########### #######---------------------############# #######--------------------############## #######-------------------############### ########----------------################# #######---------------########### ### ########------------############# T ### ########---------############### ## ########------##################### ########--####################### ####---###################### -------################## -------############ -----## Lower Hemisphere Equiangle Projection