Anite-elemen tmodel(FEM)incorporatingge- ologicpropertiescharacteristicofasubductionzoneiscom- paredwithFEMsapproximatinghomogeneouselastichalf- spaces(HEHS)stoinvestigatetheeect ofheterogeneityon coseismic and postseismic deformation predictions for the 1995 Colima-Jalisco Mw=8.0 earthquake. The FEMs are usedtocomputeacoecien tmatrixrelatingdisplacements at observation points due to unit dislocations of contact- node pairs on the fault surface. The Green's function re- sponses are used to solve the inverse problem of estimat- ing dislocation distributions from coseismic GPS displace- ments. PredictionsfromtheFEMwithheterogeneous ma- terialproperties,loadedwitheitheroftheHEHSdislocation distributions, signican tly overestimate coseismic displace- ments. Postseismic deformation predictions are also sensi- tive to the coseismic dislocation distribution, which drives poroelastic and viscoelastic relaxation. FEM-generated Green'sfunctions,whichallowforspatialvariationsinma- terialproperties,arethuspreferabletothosethatassumea simpleHEHSbecausethelatterleadstodislocationdistri- butionsunsuitableforpredictingthepostseismicresponse.
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