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.
Copyright © 2001 Advanced Geologic Exploration, Inc.
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