This is a preliminary UCB moment tensor solution for the event located 4 mi NE of Alameda, CA; 37.80N 122.18W; Z=5km; ML=4.1; (USGS/UCB Joint Notification System) on July 20, 2007 at 11:42:22 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsus/Quakes/nc40199209.php Reviewed by: CAO UCB Seismological Laboratory Inversion method: complete waveform Stations used: CVS, MCCM, MHC, SAO Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 2.52E+22 Dyne-cm Mw = 4.20 Z = 5 Plane Strike Rake Dip NP1 321 168 89 NP2 51 1 78 Principal Axes: Axis Value Plunge Azimuth T 2.520 9 275 N 0.000 78 136 P -2.520 8 7 Event Date/Time: July 20, 2007 at 11:42:22 UTC Event ID: nc40199209 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -2.418 Mxy -0.521 Mxz -0.296 Myy 2.400 Myz -0.434 Mzz 0.018 ---- ---------- P ------ ------------- --------- ###-------------------------- ######--------------------------- #########-----------------------### ###########---------------------##### ##############-----------------######## ###############---------------######### # ##############-----------############ # T ###############--------############## # #################----################ ######################-################## ####################----################# #################-------############### ##############------------############# ##########----------------########### ######---------------------######## ---------------------------###### ---------------------------## ------------------------- ------------------- ------- Lower Hemisphere Equiangle Projection