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TONGA REGION

09/03/19 18:17:37 UTC
Epicenter 23.02S 174.78W

  Me   7.7                                                             
Broadband Source Parameters:
 BROADBAND DEPTH:        34.0 km
 RADIATED ENERGY                                                      
  No. of sta: 10  Focal mech.  F                                      
  Energy       9.1+2.2*10**15 Nm                                      
 COMMENT:  Complex earthquake   
  observed on broadband         
  displacement seismograms, with
  at least one larger event     
  occurring about 4 seconds 
  after the onset.  Depth from        
  synthetics of broadband       
  displacement  seismograms 
  based on the first large 
  event following the onset.          

Explanation of Parameters
Latest USGS Energy Solutions
Source Parameter Search

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

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