This is a preliminary UCB moment tensor solution for the event 12 km SSE of San Huan Bautista, CA (36:7548 N, 121.4637 W; Z=8.96 km; ML=5.3; USGS/UCB Joint Notification System) on August 12, 1998 at 14:10:25UTC. A Mw5.1 and depth of 8 km were obtained from long-period waves recorded by JRSC, MHC and PKD. Best Fitting Double-Couple: Mo = 5.28E+23 Dyne-cm Mw = 5.12 Z = 8 km Plane Strike Rake Dip NP1 129 -171 85 NP2 38 -5 81 Principal Axes: Axis Value Plunge Azimuth T 5.280 3 263 N 0.000 80 158 P -5.280 10 354 Best regards, Douglas Dreger Hrvoje Tkalcic UCB Seismological Laboratory Berkeley Moment Tensor Solution (COMPLETE WAVEFORMS) Event Date/Time: prel Moment Tensor: Scale = 10**23 Dyne-cm Component Value Mxx -4.995 Mxy 1.150 Mxz -0.918 Myy 5.138 Myz -0.159 Mzz -0.143 Moment Magnitude = 5.12 ---- ------ P ---------- --------- ------------- ---------------------------## #---------------------------##### ###-------------------------####### ######---------------------########## #########------------------############ ###########---------------############# ##############------------############### ################--------################# #################----################## T ###################-################### ##################---################## ##################-------############## ################-----------############ #############----------------######## ##########---------------------#### ########------------------------# ####------------------------- ------------------------- ------------------- ------- Lower Hemisphere Equiangle Projection