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Pacific Coastal & Marine Science Center

Tsunamis & Earthquakes

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

Location of Sumatra earthquake on a global map
Location of Sumatra earthquake on a global map

2004 tsunami wavefield at one hour
Tsunami wave field in the Bay of Bengal one hour after the M=9.1 Sumatra-Andaman Earthquake. View to the northwest. (see a larger version of this image, 325 kb)

The December 26, 2004 magnitude (M) 9.1 Sumatra-Andaman earthquake occurred along a tectonic subduction zone in which the India Plate, an oceanic plate, is being subducted beneath the Burma micro-plate, part of the larger Sunda plate. The boundary between the downgoing and overriding plates of the subduction zone is marked by the Sunda Trench above.

The pages on this web site listed in the Table of Contents above provide a brief overview of the tectonic setting and seismological chacteristics of the earthquake, as well as a summary of tsunami generation modeling for this event and the March 28, 2005 M=8.6 northern Sumatra earthquake.

For additional information, the Disaster Prevention Research Institute at Kyoto University provides a comprehensive web site of data collected in the aftermath of this event.

Next page, Tectonics of Sumatra-Andaman IslandsTectonics of Sumatra-Andaman Islands (115 kb)


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