Magnitude 5.4 TONGA
Monday, April 20, 2009 at 20:02:23 UTC
Historic Seismicity
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver
