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Pacific Coastal and Marine Science Center

Tsunamis and Earthquakes

Tsunami Generation from the 2004 M=9.1 Sumatra-Andaman Earthquake

Base map of the Sumatra subduction zone showing seismicity associated with the 2004 Sumatra-Andaman earthquake

Aftershocks (yellow circles) occur in geographic proximity to the main shock rupture zone, extending from northern Sumatra to the Andaman Islands.

Map taken from USGS Earthquake Summary Poster
See also: USGS National Earthquake Information Center (NEIC) Preliminary Earthquake Report

base map of the Sumatra subduction zone showing seismicity


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