No evidence of unusually large postseismic deformation in Andaman region immediately after 2004 Sumatra-Andaman earthquake

Details No evidence of unusually large postseismic deformation in Andaman region immediately after 2004 Sumatra-Andaman earthquake No evidence of unusually large postseismic deformation in Andaman region immediately after 2004 Sumatra-Andaman earthquake

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3510307g&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 10, CiteID L10307

Physics

1

Geodesy And Gravity: Seismic Cycle Related Deformations (6924, 7209, 7223, 7230), Seismology: Subduction Zones (1207, 1219, 1240), Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413), Seismology: Earthquake Dynamics (1242), Geodesy And Gravity: Satellite Geodesy: Results (6929, 7215, 7230, 7240)

Scientific paper

Static offsets due to the 26 December 2004 Sumatra-Andaman earthquake have been reported from the campaign mode GPS measurements in the Andaman-Nicobar region. However, these measurements contain contributions from postseismic deformation that must have occurred in the 16-25 days period between the earthquake and the measurements. We analyse these and tide gauge measurements of coseismic deformation, a longer time series of postseismic deformation from GPS measurements at Port Blair in the South Andaman and aftershocks, to suggest that postseismic displacement not larger than 7 cm occurred in the 16-25 days following the earthquake in the South Andaman and probably elsewhere in the Andaman Nicobar region. Earlier, this contribution was estimated to be as large as 1 m in the Andaman region, which implied that the magnitude of the earthquake based on these campaign mode measurements should be decreased. We suggest an Mw for this earthquake as 9.23.

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