Date: Fri, 28 Dec 2001 13:34:26 -0800 (PST) Subject: Mw4.6 18km SSE of Tres Pinos 20011228211401UTC This is a preliminary UCB moment tensor solution for the event located 18 km SSE of Tres Pinos, CA (36.641N 121.252W Z=6.8 km, ML=4.7; USGS/UCB Joint Notification System) on December 28, 2001 at 21:14:01UTC. A Mw4.6 and depth of 5 km were obtained from long-period waves recorded by BDM, BKS, CMB, JRSC, and MHC. Best Fitting Double-Couple: Mo = 9.49E+22 Dyne-cm Mw = 4.62 Z = 5 km Plane Strike Rake Dip NP1 321 -175 87 NP2 231 -3 85 Principal Axes: Axis Value Plunge Azimuth T 9.490 1 96 N 0.000 84 352 P -9.490 6 186 Best regards, Douglas Dreger Berkeley Seismological Laboratory Berkeley Moment Tensor Solution Event Date/Time: prel Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -9.200 Mxy -1.921 Mxz 0.902 Myy 9.287 Myz 0.328 Mzz -0.086 ------- ------------------- ------------------------- ###-------------------------- ######--------------------------# #########---------------------##### ############-----------------######## ##############-------------############ ################---------############## ##################-----################## ####################-#################### ###################--################## ################-------################ T ##############----------############### ###########--------------############## #########-----------------############# ######---------------------########## ###------------------------######## #--------------------------###### ---------------------------## --------- ------------- ------ P ---------- ----