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Geophysics: The size and duration of the Sumatra-Andaman earthquake from far-field static offsets

Science

By:
, , and
DOI: 10.1126/science.1113746

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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 Mw = 9.2.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Geophysics: The size and duration of the Sumatra-Andaman earthquake from far-field static offsets
Series title:
Science
DOI:
10.1126/science.1113746
Volume
308
Issue:
5729
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1769
Last page:
1772