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The effects of rheological layering on post-seismic deformation

Hetland, E. A. and Hager, B. H. (2006) The effects of rheological layering on post-seismic deformation. Geophysical Journal International, 166 (1). pp. 277-292. ISSN 0956-540X. https://resolver.caltech.edu/CaltechAUTHORS:HETgji06

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Abstract

We examine the effects of rheological layering on post-seismic deformation using models of an elastic layer over a viscoelastic layer and a viscoelastic half-space. We extend a general linear viscoelastic theory we have previously proposed to models with two layers over a half-space, although we only consider univiscous Maxwell and biviscous Burgers rheologies. In layered viscoelastic models, there are multiple mechanical timescales of post-seismic deformation; however, not all of these timescales arise as distinct phases of post-seismic relaxation observed at the surface. The surface displacements in layered models with only univiscous, Maxwell viscoelastic rheologies always exhibit one exponential-like phase of relaxation. Layered models containing biviscous rheologies may produce multiple phases of relaxation, where the distinctness of the phases depends on the geometry and the contrast in strengths between the layers. Post-seismic displacements in models with biviscous rheologies can often be described by logarithmic functions.


Item Type:Article
Additional Information:® 2006 The Authors Accepted 2006 February 27. Received 2006 February 21; in original form 2005 December 6. Article published online 31 May 2006 Reviews by the Editor, Dr J. Beavan, and two anonymous reviewers greaty improved this paper. We thank K.J. Bathe and Adina R&D, Inc. for the use of Adina. This research was supported by NSF grant EAR-0346021.
Subject Keywords:post-seismic relaxation, rheological layering, viscoelastic relaxation
Issue or Number:1
Record Number:CaltechAUTHORS:HETgji06
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:HETgji06
Alternative URL:http://dx.doi.org/10.1111/j.1365-246X.2006.02974.x
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4853
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:11 Sep 2006
Last Modified:02 Oct 2019 23:16

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