This is a preliminary UCB moment tensor solution for the event located 8 km NNW of Healdsburg, CA; 38.679N 122.910W; Z=5.4km; ML=4.0; (USGS/UCB Joint Notification System) on July 30, 2003 at 04:50:06 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsUS/Quakes/nc40145275.htm Reviewed by: Dreger UCB Seismological Laboratory Inversion method: complete waveform Stations used: BDM BKS JRSC ORV Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 1.19E+22 Dyne-cm Mw = 4.02 Z = 8 km Plane Strike Rake Dip NP1 37 6 89 NP2 307 179 84 Principal Axes: Axis Value Plunge Azimuth T 1.190 5 262 N 0.000 84 46 P -1.190 4 172 Event Date/Time: July 30, 2003 at 04:50:06 UTC Event ID: nc40145275 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -1.140 Mxy 0.324 Mxz 0.059 Myy 1.136 Myz -0.112 Mzz 0.004 ------- ------------------- ------------------------- --------------------------### --------------------------####### ###-----------------------######### ########------------------########### ###########--------------############## ##############----------############### ##################------################# ####################--################### ##################--################## T ################------################ ###############---------############## ################-------------########## ##############-----------------######## ############--------------------##### #########------------------------## #######-------------------------- ###-------------------------- ------------------------- ----------- ----- ----- P