| Abstract: | 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. ?? Journal compilation ?? 2008 RAS. |
| Genre: | Article |
| ProdID: | 70031753 |
| Citation Author: | Pollitz, F.; Banerjee, P.; Grijalva, K.; Nagarajan, B.; Burgmann, R. |
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| Citation End Page: | 204 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geophysical Journal International |
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| Citation Number Of Pages: | 16 |
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| Citation Search Results Text: | Effect of 3-D viscoelastic structure on post-seismic relaxation from the 2004 M = 9.2 Sumatra earthquake; 2008; Article; Journal; Geophysical Journal International; Pollitz, F.; Banerjee, P.; Grijalva, K.; Nagarajan, B.; Burgmann, R. |
| Citation Start Page: | 189 |
| Citation Volume: | 173 |
| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Effect of 3-D viscoelastic structure on post-seismic relaxation from the 2004 M = 9.2 Sumatra earthquake; 2008; Article; Journal; Geophysical Journal International; Pollitz, F.; Banerjee, P.; Grijalva, K.; Nagarajan, B.; Burgmann, R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1111/j.1365-246X.2007.03666.x |
| Date Other: | Tue, 1 Jan 2008 00:00 -0600 |
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