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USGS Fast Moment Tensor Solution

Because of the size (M 9.0) of this earthquake, point-source methods that use only the body-wave portion of the seismogram are inadequate for measuring the true magnitude.

 04/12/26 00:58:50.76
 OFF W COAST OF NORTHERN SUMATRA 
 Epicenter:   3.298   95.778
 MW 8.2

 USGS MOMENT TENSOR SOLUTION
 Depth   7         No. of sta: 31
 Moment Tensor;   Scale 10**21 Nm
   Mrr= 0.91       Mtt=-0.89
   Mff=-0.02       Mrt= 1.78
   Mrf=-1.55       Mtf= 0.47
  Principal axes:
   T  Val=  2.53  Plg=55  Azm= 50
   N        0.09       8      308
   P       -2.61      34      213

 Best Double Couple:Mo=2.6*10**21
  NP1:Strike=274 Dip=13 Slip=  55
  NP2:       130     79        98
                                      
               -------                
          -----------------           
        ---##############----         
      --####################---       
    ##-########################--     
   #----########################--    
   -------############   ########-    
  ---------########### T #########-   
  -----------#########   ##########   
  -------------####################   
  ---------------##################   
  ------------------###############   
   -------------------############    
   --------   -----------#########    
    ------- P --------------#####     
      -----   -----------------       
        ---------------------         
          -----------------           
               -------

Moment Tensor Solution

Explanation of Parameters
Current USGS Fast Moment Tensor Solutions
USGS E-mail Notification Services
Source Parameter Search

For more information, contact Stuart Sipkin sipkin@usgs.gov

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U.S. Department of the Interior \| U.S. Geological Survey URL: http://neic.usgs.gov/neis/eq_depot/2004/eq_041226/neic_slav_q.html Contact: NEIC Web Team Last modification: Sunday, 2004 December 26 109:4932 MST