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AGU: Geophysical Research Letters

 

Keywords

  • GRACE
  • Sumatra-Andaman earthquake
  • deformation
  • rupture
  • gravity change

Index Terms

  • Geodesy and Gravity: Time variable gravity
  • Geodesy and Gravity: Satellite geodesy: results
  • Geodesy and Gravity: Seismic cycle related deformations
  • Seismology: Oceanic crust
  • Seismology: Subduction zones

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L13302, 5 PP., 2007
doi:10.1029/2007GL030356

GRACE detects coseismic and postseismic deformation from the Sumatra-Andaman earthquake

J. L. Chen

Center for Space Research, University of Texas at Austin, Texas, USA

C. R. Wilson

Center for Space Research, University of Texas at Austin, Texas, USA

Department of Geological Sciences, University of Texas at Austin, Texas, USA

B. D. Tapley

Center for Space Research, University of Texas at Austin, Texas, USA

S. Grand

Department of Geological Sciences, University of Texas at Austin, Texas, USA

We show that spherical harmonic (SH) solutions of the Gravity Recovery and Climate Experiment (GRACE) are now of sufficient quality to observe effects of co-seismic and post-seismic deformation due to the rupture from the Mw = 9.3 Sumatra-Andaman earthquake on December 26, 2004, and its companion Nias earthquake (Mw = 8.7) on March 28, 2005. The improved GGM 03 SH (Level 2) solutions, and improved filtering methods provide estimates with spatial resolution comparable to earlier estimates from range-rate (Level 1) GRACE data. The gravity field disturbance extends over 1800 km along Andaman and Sunda subduction zones, and changes with time following events. Gravity changes may be due to afterslip, viscoelastic relaxation, or other processes associated with dilatation. Satellite gravity measurements from GRACE provide a unique new measure of deformation and post-seismic processes associated with major earthquakes, especially in areas which are primarily oceanic.

Received 12 April 2007; accepted 5 June 2007; published 4 July 2007.

Citation: Chen, J. L., C. R. Wilson, B. D. Tapley, and S. Grand (2007), GRACE detects coseismic and postseismic deformation from the Sumatra-Andaman earthquake, Geophys. Res. Lett., 34, L13302, doi:10.1029/2007GL030356.

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