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This is a preliminary UCB moment tensor solution for the event 18 km E of San Jose (37.3N 121.7W; Z=8 km; ML=4.4; USGS/UCB JOint Notification System) on February 25, 2001 at 23:18UTC. A Mw4.4 and depth of 11 km were obtained from long period waves recorded by BDM, JRSC, and SAO. Best Fitting Double-Couple: Mo = 4.22E+22 Dyne-cm Mw = 4.38 Z = 11 km Plane Strike Rake Dip NP1 325 -167 79 NP2 232 -11 77 Principal Axes: Axis Value Plunge Azimuth T 4.220 1 99 N 0.000 73 5 P -4.220 17 189 Best regards, Douglas Dreger UCB Seismological Laboratory Berkeley Moment Tensor Solution Event Date/Time: prel Moment Tensor: Scale = 10**22 Dyne-cm Component Value Mxx -3.676 Mxy -1.213 Mxz 1.148 Myy 4.031 Myz 0.271 Mzz -0.356 ------- ------------------- #------------------------ #####------------------------ #########------------------------ ############------------------##### ###############------------########## #################--------############## ###################---################# ######################################### ##################----################### ################--------################# ##############-----------############## ############--------------############# T #########-----------------############ #######--------------------############ #####----------------------########## ##-------------------------######## ---------------------------###### ---------- -------------### -------- P -------------# ----- ----------- ------- Lower Hemisphere Equiangle Projection
- Subtract 8 hours from Greenwich Mean Time to obtain PST or 4 hours for EST
- Location Quality: A (good), B (fair), C (poor), D (bad)
- Magnitude: Ml (local or Richter magnitude), Lg (mblg), Md (duration), Mb (body wave), Ms (surface wave), Mw (moment)
- Standard Sources Include:
- U.S. Geological Survey, National Earthquake Information Center, Golden, CO (NEIC)
- Harvard Geophysical Observatory, Harvard University, Cambridge, MA (HRV)
- U.S. Geological Survey, Northern California Seismic Network (NCSN)
- University of California, Berkeley, Seismological Laboratory (UCBSL)
- California Institute of Technology, Pasadena, California (Caltech)
- various wire reports and/or personal communications
- All data are preliminary and subject to change.
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