World Seismicity

World Seismicity during 1977-1992 are plotted over topography and bathymetry map.
Over 10,000 large earthquakes with magnitude (mb) greater than 5.5 are plotted.
Notice that majority of the large earthquakes occurs at or close to major plate boundaries
(indicated by thick yellow lines). Focal depth of earthquakes are plotted with colors;
blak=shallow events (0-70 km), green=intermediate depth (70-300 km), and red=deep focus events (300-700 km).

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Won-Young Kim, Lamont-Doherty Earth Observatory of Columbia University, copyright©1999, all rights reserved