This is a preliminary UCB moment tensor solution for the event located 8 km SSE of Parkfield, CA; 35.839N 120.387W; Z=9.3km; ML=4.0; (USGS/UCB Joint Notification System) on September 28, 2004 at 19:31:27 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsUS/Quakes/nc51148061.htm Reviewed by: Dolenc UCB Seismological Laboratory Inversion method: complete waveform Stations used: KCC, MHC, PACP, and SAO Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 1.38E+22 Dyne-cm Mw = 4.06 Z = 8. km Plane Strike Rake Dip NP1 56 -11 90 NP2 146 -180 79 Principal Axes: Axis Value Plunge Azimuth T 1.371 7 101 N 0.027 79 233 P -1.398 8 10 Source Composition: Type Percent DC 96.2 CLVD 3.8 Iso 0.0 Event Date/Time: September 28, 2004 at 19:31:27 UTC Event ID: nc51148061 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -1.278 Mxy -0.492 Mxz -0.224 Myy 1.257 Myz 0.133 Mzz 0.022 ----- ----------- P ----- #------------- -------- ####------------------------- ######--------------------------- ########--------------------------# ##########----------------------##### ############------------------######### #############---------------########### ###############-----------############### #################------################## ######################################### ###################################### ################---################### T ############--------################# #########-------------################# #####-----------------############### #----------------------############ ------------------------######### ------------------------##### ------------------------# ------------------- -------