This is a preliminary UCB moment tensor solution for the event located Near Arcata; 40.780N 124.208W; Z=21.3km; ML=4.2; (USGS/UCB Joint Notification System) on April 21, 2008, 22:00:54 UTC. Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsus/Quakes/nc40215734.php Reviewed by: Peggy UCB Seismological Laboratory Inversion method: complete waveform Stations used: KCT WDC YBH GASB Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 2.38E+22 Dyne-cm Mw = 4.19 Z = 21 Plane Strike Rake Dip NP1 301 -79 61 NP2 99 -109 31 Principal Axes: Axis Value Plunge Azimuth T 2.380 15 23 N 0.000 10 116 P -2.380 72 237 Event Date/Time: April 21, 2008, 22:00:54 UTC Event ID: nc40215734 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx 1.806 Mxy 0.688 Mxz 0.948 Myy 0.175 Myz 0.826 Mzz -1.981 ####### ############### # ################## T #### #################### ###### ################################# ################################### --------------####################### --------------------################### -----------------------################ ---------------------------############## -----------------------------############ #--------------- ------------########## ##-------------- P --------------######## ###------------- ----------------###### ###--------------------------------###- #####-------------------------------#-- ######----------------------------##- ########----------------------##### ############------------######### ############################# ######################### ################### ####### Lower Hemisphere Equiangle Projection