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Rupture Process of the 2004 Sumatra-Andaman Earthquake
Credit:
Charles J. Ammon, Pennsylvania State University; Chen Ji, Vala Hjorleifsdottir, Hiroo Kanamori, Don Helmberger, California Institute of Technology; Hong Kie Thio, Gene Ichinose, URS Corporation; David Robinson, Shamita Das, University of Oxford; Sidao Ni,
(A) Fault slip 168s after rupture initiation estimated by using 20 azimuthally distributed teleseismic SH waveforms. The rupture model consists of two faults, the first having a strike of 329° and a dip of 8° and the second having a strike of 333° and a dip of 7°. (B) Slip distribution from analysis of intermediate period surface waves and long-period seismograms. While small-scale features are averaged out, this model provides an excellent fit to all long period seismic observations for the event. (C) Slip distribution obtained using teleseismic body waves (50 to 200 s), intermediate period three component regional waves (50 to 500 s) and long-period teleseismic waves (250 to 2000 s).
Ammon, C., et. al., Rupture process of the 2004 Sumatra-Andaman earthquake, Science, 308, 1133-1139, 2005.
Supported by NSF grants EAR-0125595, EAR-0337491.
Date Taken: January 1, 2006 Photographer / Contributor: Charles J. Ammon
