Effect of 3-D viscoelastic structure on post-seismic relaxation from the 2004 M = 9.2 Sumatra earthquake

Details Effect of 3-D viscoelastic structure on post-seismic relaxation from the 2004 M = 9.2 Sumatra earthquake Effect of 3-D viscoelastic structure on post-seismic relaxation from the 2004 M = 9.2 Sumatra earthquake

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geoji.173..189p&link_type=abstract

Geophysical Journal International, Volume 173, Issue 52, pp. 189-204.

Astronomy and Astrophysics

Astronomy

16

Numerical Solutions, Continental Margins: Convergent, Dynamics Of Lithosphere And Mantle, Rheology: Mantle

Scientific paper

The 2004 M = 9.2 Sumatra-Andaman earthquake profoundly altered the state of stress in a large volume surrounding the ~1400 km long rupture. Induced mantle flow fields and coupled surface deformation are sensitive to the 3-D rheology structure. To predict the post-seismic motions from this earthquake, relaxation of a 3-D spherical viscoelastic earth model is simulated using the theory of coupled normal modes. The quasi-static deformation basis set and solution on the 3-D model is constructed using: a spherically stratified viscoelastic earth model with a linear stress-strain relation; an aspherical perturbation in viscoelastic structure; a `static' mode basis set consisting of Earth's spheroidal and toroidal free oscillations; a ``viscoelastic'' mode basis set; and interaction kernels that describe the coupling among viscoelastic and static modes. Application to the 2004 Sumatra-Andaman earthquake illustrates the profound modification of the post-seismic flow field at depth by a slab structure and similarly large effects on the near-field post-seismic deformation field at Earth's surface. Comparison with post-seismic GPS observations illustrates the extent to which viscoelastic relaxation contributes to the regional post-seismic deformation.

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