This is a preliminary UCB moment tensor solution for the event located 28 km ESE of Arcata, CA; 40.740N 123.802W; Z=18.9km; ML=3.9; (USGS/UCB Joint Notification System) on December 5, 2004 at 1:48:04 (UTC). Other information about this event can be viewed at: http://earthquake.usgs.gov/recenteqsUS/Quakes/nc40169129.htm Reviewed by: DReger UCB Seismological Laboratory Inversion method: complete waveform Stations used: HOPS HUMO ORV YBH Berkeley Moment Tensor Solution Best Fitting Double-Couple: Mo = 2.72E+22 Dyne-cm Mw = 4.26 Z = 21 km Plane Strike Rake Dip NP1 181 -75 49 NP2 338 -107 43 Principal Axes: Axis Value Plunge Azimuth T 2.720 3 260 N 0.000 12 351 P -2.720 78 155 Event Date/Time: December 5, 2004 at 1:48:04 (UTC) Event ID: nc40169129 Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -0.013 Mxy 0.511 Mxz 0.471 Myy 2.607 Myz -0.386 Mzz -2.595 ---#### #####--############ #########---############# #########--------############ ##########-----------############ ##########-------------############ ###########---------------########### ###########-----------------########### ###########------------------########## ###########--------------------########## ###########--------------------########## ###########--------- ---------######### #########--------- P ---------######### T #########--------- ---------######### ##########--------------------######## ###########--------------------######## ###########-------------------####### ##########-------------------###### ##########-----------------###### #########----------------#### ########--------------### #######-----------# ###----