Earthquake Density Maps
Magnitude 4.9 TONGA
Friday, October 21, 2011 at 14:56:05 UTC
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Average number of Earthquakes per Year per 12,300 km2, Magnitude 5 and Greater
Intermediate Earthquakes: Depth 70-300 km
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
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Average number of Earthquakes per Year per 12,300 km2, Magnitude 5 and Greater
All Depths
Major Tectonic Boundaries: Subduction Zones -purple, Ridges -red and Transform Faults -green
Global Earthquake Density Maps
Preliminary Earthquake Report
U.S. Geological Survey, National Earthquake Information Center
World Data Center for Seismology, Denver
