Moment Tensor Solution - September 20, 2001 - Mendocino earthquake
UC Berkeley, Seismology Laboratory 
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This is a preliminary UCB moment tensor solution for the event located 84km W of Petrolia, CA (40.444N 125.270W; Z=2.4; ML=4.5). A Mw 5.1 and depth of 8 km were obtained from long-period data recorded by BDSN stations ORV, YBH, HOPS, WDC. The discrepancy between the short-period and long-period magnitude estimates has been observed in other events located along the Mendocino Fracture Zone.

 Best Fitting Double-Couple:
    Mo = 4.46E+23 Dyne-cm
    Mw = 5.07
    Plane   Strike   Rake   Dip
     NP1       95    -171    84
     NP2        4      -6    81
 Principal Axes:
    Axis    Value   Plunge   Azimuth
      T     4.460       2      229
      N     0.000      79      128
      P    -4.460      11      320

 Douglas Dreger
 Berkeley Seismological Laboratory

 Berkeley Moment Tensor Solution
 
 Event Date/Time: prel
 
 Moment Tensor: Scale = 10**23 Dyne-cm
    Component   Value
       Mxx     -0.617
       Mxy      4.327       Mxz     -0.720
       Myy      0.762
       Myz      0.399       Mzz     -0.145
 
                    -----##                    
              -----------########              
             ------------###########           
         - P -------------############         
       ---   -------------##############       
      --------------------###############      
     ---------------------################     
    ----------------------#################    
    ----------------------#################    
   -----------------------##################   
   -----------------------##################   
   #########--------------##################   
   ######################-----#############-   
   ######################-------------------   
    #####################------------------    
    #####################------------------    
     ####################-----------------     
      #   ##############-----------------      
        T ##############----------------       
          ##############--------------         
           ############-------------           
              #########----------              
                    ##-----                    
                                               
     Lower Hemisphere Equiangle Projection
 
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