Finite Element Analysis of Fault Bend Influence on Stick-Slip Instability along an Intra-Plate Fault |
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| Authors: | H L Xing P Mora A Makinouchi |
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| Institution: | 1. Earth Systems Science Computational Centre, The University of Queensland, St. Lucia, Brisbane, QLD, 4072, Australia
2. The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan
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| Abstract: | — Earthquakes have been recognized as resulting from stick-slip frictional instabilities along the faults between deformable rocks. A three-dimensional finite-element code for modeling the nonlinear frictional contact behaviors between deformable bodies with the node-to-point contact element strategy has been developed and applied here to investigate the fault geometry influence on the nucleation and development process of the stick-slip instability along an intra-plate fault through a typical fault bend model, which has a pre-cut fault that is artificially bent by an angle of 5.6° at the fault center. The numerical results demonstrate that the geometry of the fault significantly affects nucleation, termination and restart of the stick-slip instability along the intra-plate fault, and all these instability phenomena can be well simulated using the current finite-element algorithm. |
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