USGS Energy and Broadband Solution

OFF EAST COAST OF HONSHU, JAPAN
12/12/07 08:18:24 UTC
Epicenter: 37.89N 144.09E

 Energy Magnitude         Me 7.3                                       
Broadband Source Parameters:
 BROADBAND DEPTH:        31.0 km
 BROADBAND FAULT PLANE SOLUTION: 
 NP1:Strike=175 Dip=60 Slip=  80
 NP2:        14     31       107
 Principal Axes:
  T              Plg=73  Azm= 60
  P                  14      272
 RADIATED ENERGY:                                                     
  No. of sta: 25  Focal mech.  F                                      
  Energy       2.0+0.4*10**15 Nm                                      
 COMMENT:   Complex earthquake  
  observed on broadband         
  displacement seismograms, with
  at least one large event      
  following an initial small    
  onset.  Depths 31 and 36 km   
  for the initial small onset   
  and first large event,        
  respectively, from            
  synthetics of broadband       
  displacement seismograms.     
  seismograms.                  
  Apparent Stress       1.78 MPa

Explanation of Parameters
Latest USGS Energy Solutions
Source Parameter Search

For more information, contact George Choy, choy@usgs.gov