Seismic Hazard Map
Magnitude 4.9 SAMOA ISLANDS REGION
Wednesday, September 21, 2011 at 23:10:46 UTC
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Global Seismic Hazard Assessment Program -GSHAP
Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver
