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http://hdl.handle.net/2122/1129
Authors: | Megna, A.* Barba, S.* Santini, S.* |
Title: | Normal-fault stress and displacement through finite-element analysis | Issue Date: | Dec-2005 | Series/Report no.: | 6/48 (2005) | URI: | http://hdl.handle.net/2122/1129 | Keywords: | algorithms earthquakes faults theoretical studies numerical models analytical models displacements stress |
Subject Classification: | 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques 05. General::05.01. Computational geophysics::05.01.05. Algorithms and implementation |
Abstract: | We compute displacement and stress due to a normal fault by means of two-dimensional plane-strain finite-element analysis. To do so, we apply a system of forces to the fault nodes and develop an iterative algorithm serving to determine the force magnitudes for any slip distribution. As a sample case, we compute the force magnitudes assuming uniform slip on a 10-km two-dimensional normal fault. The numerical model generates displacement and stress fields that compare well with the analytical solution. In fact, we found little difference in displacements (<5%), displacement orientation (<15°), and stress components (<35%, half of which due to slip tolerance). We analyze such misfit, and discuss how the error propagates from displacement to stress. Our scheme provides a convenient way to use the finite-elements direct method in a trial-and-error procedure to reproduce any smooth slip distribution. |
Appears in Collections: | Annals of Geophysics Conference materials Article published / in press Manuscripts |
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