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Journal of Mountain Science

, Volume 7, Issue 1, pp 36–44 | Cite as

Fault type analysis along the San Andreas Fault zone: A numerical approach

  • Matrika Prasad KoiralaEmail author
  • Daigoro Hayashi
Article
  • 122 Downloads

Abstract

Finite Element (FE) modeling under plane stress condition is used to analyze the fault type variation with depth along and around the San Andreas Fault (SAF) zone. In this simulation elastic rheology was used and was thought justifiable as the variation in depth from 0.5 km to 20 km was considered. Series of calculations were performed with the variation in domain properties. Three types of models were created based on simple geological map of California, namely, 1) single domain model considering whole California as one homogeneous domain, 2) three domains model including the North American plate, Pacific plate, and SAF zone as separate domains, and 3) Four domains model including the three above plus the Garlock Fault zone. Mohr-Coulomb failure criterion and Byerlee’s law were used for the calculation of failure state. All the models were driven by displacement boundary condition imposing the fixed North American plate and Pacific plate motion along N34°W vector up to the northern terminus of SAF and N50°E vector motion for the subducting the Gorda and Juan de Fuca plates. Our simulated results revealed that as the depth increased, the fault types were generally normal, and at shallow depth greater strike slip and some thrust faults were formed. It is concluded that SAF may be terminated as normal fault at depth although the surface expression is clearly strike slip.

Keywords

Finite Element modeling plane stress fault type analysis San Andreas Fault zone rock domain properties failure analysis 

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Copyright information

© Science Press, Institute of Mountain Hazards and Environment, CAS and Springer Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Simulation Tectonics Laboratory, Faculty of ScienceUniversity of the RyukyusNishihara, OkinawaJapan

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