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Earthquake Hazards Program

USGS Fast Moment Tensor Solution

Because of the size (M 8.7) of this earthquake, point-source methods that use only the body-wave portion of the seismogram are inadequate for measuring the true magnitude.

 05/03/28 16:09:37.06
 NORTHERN SUMATRA, INDONESIA     
 Epicenter:   2.093   97.016
 MW 8.1

 USGS MOMENT TENSOR SOLUTION
 Depth  21         No. of sta: 17
 Moment Tensor;   Scale 10**21 Nm
   Mrr= 0.26       Mtt=-0.20
   Mff=-0.07       Mrt= 1.12
   Mrf=-1.04       Mtf=-0.20
  Principal axes:
   T  Val=  1.70  Plg=47  Azm= 45
   N       -0.33       3      312
   P       -1.37      43      219

 Best Double Couple:Mo=1.5*10**21
  NP1:Strike=251 Dip= 4 Slip=  29
  NP2:       132     88        93
                                      
               -------                
          --##############-           
        -####################         
      -########################       
    #---########################-     
   #------#############   ########    
   ---------########### 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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