Rupture process of the 2004 Sumatra-Andaman earthquake.
The 26 December 2004 Sumatra-Andaman earthquake initiated slowly, with small slip and a slow rupture speed for the first 40 to 60 seconds. Then the rupture expanded at a speed of about 2.5 kilometers per second toward the north northwest, extending 1200 to 1300 kilometers along the Andaman trough. Peak displacements reached approximately 15 meters along a 600-kilometer segment of the plate boundary offshore of northwestern Sumatra and the southern Nicobar islands. Slip was less in the northern 400 to 500 kilometers of the aftershock zone, and at least some slip in that region may have occurred on a time scale beyond the seismic band.
Ammon
Charles J
CJ
Department of Geosciences, Pennsylvania State University, 440 Deike Building, University Park, PA 16802, USA. cammon@geosc.psu.edu
Ji
Chen
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Thio
Hong-Kie
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Robinson
David
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Ni
Sidao
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Hjorleifsdottir
Vala
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Kanamori
Hiroo
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Lay
Thorne
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Das
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Helmberger
Don
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Ichinose
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Wald
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