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Earthquake Hazards Program

Magnitude 7.2 SOUTH ISLAND OF NEW ZEALAND

2003 August 21 12:12:50 UTC

Preliminary Earthquake Report

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

USGS Fast Moment Tensor Solution

 03/08/21 12:12:50.90
 SOUTH ISLAND OF NEW ZEALAND     
 Epicenter: -45.183  167.121
 MW 7.1

 USGS MOMENT TENSOR SOLUTION
 Depth  28         No. of sta: 20
 Moment Tensor;   Scale 10**19 Nm
   Mrr= 2.55       Mtt= 0.34
   Mff=-2.89       Mrt=-1.97
   Mrf=-2.34       Mtf=-2.65
  Principal axes:
   T  Val=  3.82  Plg=65  Azm=157
   N        1.68      13       36
   P       -5.50      21      301

 Best Double Couple:Mo=4.7*10**19
  NP1:Strike=  8 Dip=27 Slip=  59
  NP2:       222     67       105
                                      
                                      
               ------#                
          --------------###           
        ------------------###         
      --------------------#----       
    --   --------------#####-----     
   --- P -----------#########-----    
   ---   ---------############----    
  --------------##############-----   
  ------------################-----   
  -----------#################-----   
  ----------#######   ########-----   
  --------######### T ########-----   
   ------##########   #######-----    
   ------###################------    
    ----###################------     
      -###################-----       
        ################-----         
          ###########------           
               ##-----                
                                      

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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