Coseismic and postseismic deformation of the 2011 tohoku-oki earthquake constrained by GRACE gravimetry

Lei Wang, C. K. Shum, Frederik Jozef Simons, Byron Tapley, Chunli Dai

Research output: Contribution to journalArticle

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Abstract

Spaceborne gravimetry data from the Gravity Recovery And Climate Experiment (GRACE) are processed using spatio-spectral Slepian localization analysis enabling the high-resolution detection of permanent gravity change associated with both coseismic and postseismic deformation resulting from the great 11 March 2011 Mw 9.0 Tohoku-Oki earthquake. The GRACE observations are then used in a geophysical inversion to estimate a new slip model containing both coseismic slip and after-slip. The GRACE estimated moment for the total slip, up to the end of July 2011 is estimated as (4.59 ± 0.49) × 1022 Nm, equivalent to a composite Mw of 9.07 ± 0.65. If the moment for the Tohoku-Oki main shock is assumed to be 3.8 × 1022 Nm, the contribution from the after-slip is estimated to be 3.0 × 10 21-12.8 × 1021 Nm, in good agreement with a postseismic slip model inverted from GPS data. We conclude that GRACE data provide an independent constraint to quantify co-and post-seismic deformation for the Tohoku-Oki event.

Original languageEnglish (US)
Article numberL07301
JournalGeophysical Research Letters
Volume39
Issue number7
DOIs
StatePublished - Apr 1 2012

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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