Seismic Hazard Map
Magnitude 4.9 TONGA
Wednesday, May 18, 2011 at 08:10:14 UTC
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
