This is a preliminary UCB moment tensor solution for the event located 5 km NE of Geysers; 38.834N 122.765W; Z=4km; ML=4.4; (USGS/UCB Joint Notification System) on February 18, 2004 at 20:37:46 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsUS/Quakes/nc40153486.htm Reviewed by: David Dolenc UCB Seismological Laboratory Inversion method: complete waveform Stations used: BDM, BKS, CMB, and CVS Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 5.46E+22 Dyne-cm Mw = 4.46 Z = 5 km Plane Strike Rake Dip NP1 14 -100 50 NP2 209 -78 41 Principal Axes: Axis Value Plunge Azimuth T 5.460 5 111 N 0.000 8 20 P -5.460 81 231 Event Date/Time: February 18, 2004 at 20:37:46 UTC Event ID: nc40153486 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx 0.651 Mxy -1.884 Mxz 0.365 Myy 4.644 Myz 1.053 Mzz -5.295 ####### ################--- ###############-----##### ##############---------###### #############------------######## ############---------------######## ###########-----------------######### ###########------------------########## ##########-------------------########## ##########--------------------########### #########---------------------########### ########--------- ----------########### ########--------- P ---------############ ########--------- ---------############ ######---------------------######### ######---------------------######### T #####--------------------########## #####------------------############ ####----------------############# ###--------------############ ##-----------############ -------############ #######