Magnitude 7.2 Vanuatua Islands

USGS Energy and Broadband Solution

VANUATU ISLANDS

02/01/02 17:22:50 UTC
Epicenter 17.78S 167.83E

BROADBAND SOURCE PARAMETERS
 Energy Magnitude:
  Me                         7.3
 Radiated Energy:
  Es               1.7*10**15 Nm
  No. of sta:  9  Focal mech.  M
 Broadband Depth:        21.0 km
 Broadband Fault Plane Solution:
 NP1:Strike=195 Dip=75 Slip=  90
 NP2:        15     15        90
 Principal Axes:
  T              Plg=60  Azm=105
  P                  30      285
 COMMENT:  Complex earthquake  observed on broadband         
  displacement seismograms. A small event is followed 
  by a large event about 7 seconds later. Depth based on        
  synthetics of broadband displacement seismograms
  based on second event.

Explanation of Parameters