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Earthquake Hazards Program

Magnitude 8.3 HOKKAIDO, JAPAN REGION

2003 September 25 19:50:06 UTC

Preliminary Earthquake Report

U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver

USGS Fast Moment Tensor Solution

 03/09/25 19:50: 8.93
 HOKKAIDO, JAPAN REGION          
 Epicenter:  42.171  143.719
 MW 8.1

 USGS MOMENT TENSOR SOLUTION
 Depth  13         No. of sta: 55
 Moment Tensor;   Scale 10**21 Nm
   Mrr= 0.35       Mtt=-0.18
   Mff=-0.17       Mrt= 1.01
   Mrf= 1.18       Mtf=-0.26
  Principal axes:
   T  Val=  1.56  Plg=52  Azm=309
   N        0.08       2       41
   P       -1.64      38      132

 Best Double Couple:Mo=1.6*10**21
  NP1:Strike=234 Dip= 7 Slip= 103
  NP2:        41     83        88
                                      
               -------                
          ---############--           
        --###################         
      --####################---       
    --#####################------     
   --#####################--------    
   -#######   ###########---------    
  -######## 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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