title: Rupture process of the 2004 Sumatra-Andaman earthquake.
abstract: 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.
authors.affiliation: Department of Geosciences, Pennsylvania State University, 440 Deike Building, University Park, PA 16802, USA. cammon@geosc.psu.edu
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Ammon
authors.forename: Chen
authors.initials: C
authors.lastname: Ji
authors.forename: Hong-Kie
authors.initials: HK
authors.lastname: Thio
authors.forename: David
authors.initials: D
authors.lastname: Robinson
authors.forename: Sidao
authors.initials: S
authors.lastname: Ni
authors.forename: Vala
authors.initials: V
authors.lastname: Hjorleifsdottir
authors.forename: Hiroo
authors.initials: H
authors.lastname: Kanamori
authors.forename: Thorne
authors.initials: T
authors.lastname: Lay
authors.forename: Shamita
authors.initials: S
authors.lastname: Das
authors.forename: Don
authors.initials: D
authors.lastname: Helmberger
authors.forename: Gene
authors.initials: G
authors.lastname: Ichinose
authors.forename: Jascha
authors.initials: J
authors.lastname: Polet
authors.forename: David
authors.initials: D
authors.lastname: Wald