Rupture process of the 2004 Sumatra-Andaman earthquake

Charles J. Ammon, Chen Ji, Hong Kie Thio, David Robinson, Sidao Ni, Vala Hjorleifsdottir, Hiroo Kanamori, Thorne Lay, Shamita Das, Don Helmberger, Gene Ichinose, Jascha Polet, David Wald

Research output: Contribution to journalReview articlepeer-review

612 Scopus citations


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 ∼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.

Original languageEnglish (US)
Pages (from-to)1133-1139
Number of pages7
Issue number5725
StatePublished - May 20 2005

All Science Journal Classification (ASJC) codes

  • General


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