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Rupture Process of the 2004 Sumatra-Andaman Earthquake

2005; American Association for the Advancement of Science; Volume: 308; Issue: 5725 Linguagem: Inglês

10.1126/science.1112260

1095-9203

Charles J. Ammon, Chen Ji, H. K. Thio, David P. Robinson, Sidao Ni, Vala Hjörleifsdóttir, Hiroo Kanamori, Thorne Lay, Shamita Das, D. V. Helmberger, G. A. Ichinose, J. Polet, David J. Wald,

Geological and Geophysical Studies

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.