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Homogeneous vs heterogeneous subduction zone models: Coseismic and postseismic deformation

Masterlark, T. and DeMets, C. and Wang, H. F. and Sánchez, O. and Stock, J. (2001) Homogeneous vs heterogeneous subduction zone models: Coseismic and postseismic deformation. Geophysical Research Letters, 28 (21). pp. 4047-4050. ISSN 0094-8276. doi:10.1029/2001GL013612.

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A finite-element model (FEM) incorporating geologic properties characteristic of a subduction zone is compared with FEMs approximating homogeneous elastic half-spaces (HEHS)s to investigate the effect of heterogeneity on coseismic and postseismic deformation predictions for the 1995 Colima-Jalisco M_w =8.0 earthquake. The FEMs are used to compute a coefficient matrix relating displacements at observation points due to unit dislocations of contact-node pairs on the fault surface. The Green's function responses are used to solve the inverse problem of estimating dislocation distributions from coseismic GPS displacements. Predictions from the FEM with heterogeneous material properties, loaded with either of the HEHS dislocation distributions, significantly overestimate coseismic displacements. Postseismic deformation predictions are also sensitive to the coseismic dislocation distribution, which drives poroelastic and viscoelastic relaxation. FEM-generated Green's functions, which allow for spatial variations in material properties, are thus preferable to those that assume a simple HEHS because the latter leads to dislocation distributions unsuitable for predicting the postseismic response.

Item Type:Article
Related URLs:
URLURL TypeDescription
Masterlark, T.0000-0001-8317-7167
DeMets, C.0000-0001-7460-1165
Stock, J.0000-0003-4816-7865
Additional Information:© 2001 American Geophysical Union. Received: 8 Jun 2001. Accepted: 21 Aug 2001. This project was funded by NSF EAR9909321 (CD), EAR9909377 (JS), and the Lewis Weeks endowment (CD).
Group:Seismological Laboratory, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Lewis Weeks endowmentUNSPECIFIED
Issue or Number:21
Record Number:CaltechAUTHORS:20140415-145647377
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Official Citation:Homogeneous vs heterogeneous subduction zone models: Coseismic and postseismic deformation (pages 4047–4050) T. Masterlark, C. DeMets, H. F. Wang, O. Sánchez and J. Stock DOI: 10.1029/2001GL013612
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44965
Deposited By: Ruth Sustaita
Deposited On:15 Apr 2014 22:56
Last Modified:08 Nov 2022 22:15

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