The Size and Duration of the Sumatra-Andaman Earthquake from Far-Field Static Offsets-Reference-Cited by-同舟云学术

The Size and Duration of the Sumatra-Andaman Earthquake from Far-Field Static Offsets

Published:2005-06-17 Issue:5729 Volume:308 Page:1769-1772
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Banerjee P.¹²³,Pollitz F. F.¹²³,Bürgmann R.¹²³

Affiliation:

1. Wadia Institute of Himalayan Geology, Dehra Dun, 248001, India.

2. U.S. Geological Survey, Menlo Park, CA 94025, USA.

3. Department of Earth and Planetary Science and Berkeley Seismological Laboratory, University of California, Berkeley, CA 94720, USA.

Abstract

The 26 December 2004 Sumatra earthquake produced static offsets at continuously operating GPS stations at distances of up to 4500 kilometers from the epicenter. We used these displacements to model the earthquake and include consideration of the Earth's shape and depth-varying rigidity. The results imply that the average slip was >5 meters along the full length of the rupture, including the ∼650-kilometer-long Andaman segment. Comparison of the source derived from the far-field static offsets with seismically derived estimates suggests that 25 to 35% of the total moment release occurred at periods greater than 1 hour. Taking into consideration the strong dip dependence of moment estimates, the magnitude of the earthquake did not exceed M w = 9.2.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference16 articles.

1. The Great Sumatra-Andaman Earthquake of 26 December 2004

2. Rupture Process of the 2004 Sumatra-Andaman Earthquake

3. Speed and size of the Sumatra earthquake

4. The GPS data are from stations belonging to the IGS global network the BAKOSURTANAL Indonesian network the Sumatran GPS Array operated by the Tectonic Observatory at Caltech and the Indonesian Institute of Science (LIPI) and the Indian “National Program on GPS” Network of the Department of Science and Technology made available by the Survey of India GPS Data Centre.

5. We use daily solutions of global GPS stations processed and archived at the Scripps Orbital and Permanent Array Center (http://sopac.ucsd.edu). Eighteen IGS stations located >5000 km from the rupture are used in the ITRF-2000 reference frame realization. Our regional solution includes 25 stations 9 of which are in common with the SOPAC solution (table S1).

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