This is a preliminary UCB moment tensor solution for the event 7 km NW of
Parkfield, CA (35.95N 120.50W; Z=10.6km; ML=4.0; USGS/UCB Joint Notification
System) on February 26, 1999 at 15:25:56.7UTC. A Mw4.0 and depth of 11 km
were obtained from long-period waves recorded by KCC, SAO and MHC.
 
 Best Fitting Double-Couple:
    Mo = 1.33E+22 Dyne-cm
    Mw = 4.05
    Z  = 11 km
    Plane   Strike   Rake   Dip
     NP1      148     174    88
     NP2      238       2    84
 Principal Axes:
    Axis    Value   Plunge   Azimuth
      T     1.330       6      103
      N     0.000      84      310
      P    -1.330       3      193
 
 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     -1.191
       Mxy     -0.584
       Mxz      0.034
       Myy      1.181
       Myz      0.142
       Mzz      0.010
 
                                               
                                               
                    -------                    
              -------------------              
           ##-----------------------           
         #####------------------------         
       ########-------------------------       
      ##########-------------------------      
     ############--------------------#####     
    ##############----------------#########    
    ################----------#############    
   ##################------#################   
   ###################--####################   
   ##################--#####################   
   ###############------#################      
   ############----------################ T    
    #########-------------###############      
    ######------------------###############    
     ###---------------------#############     
      ------------------------###########      
       ------------------------#########       
         ------------------------#####         
           -----------------------##           
              ---   -------------              
                  P -------                    
                                               
     Lower Hemisphere Equiangle Projection