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Volume 25 Issue 4
Aug 2014
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Yujiang Li, Lianwang Chen, Pei Tan, Hong Li. Lower Crustal Flow and Its Relation to the Surface Deformation and Stress Distribution in Western Sichuan Region, China. Journal of Earth Science, 2014, 25(4): 630-637. doi: 10.1007/s12583-014-0467-x
Citation: Yujiang Li, Lianwang Chen, Pei Tan, Hong Li. Lower Crustal Flow and Its Relation to the Surface Deformation and Stress Distribution in Western Sichuan Region, China. Journal of Earth Science, 2014, 25(4): 630-637. doi: 10.1007/s12583-014-0467-x

Lower Crustal Flow and Its Relation to the Surface Deformation and Stress Distribution in Western Sichuan Region, China

doi: 10.1007/s12583-014-0467-x
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  • Corresponding author: Yujiang Li, toleeyj@gmail.com
  • Received Date: 28 Sep 2013
  • Accepted Date: 21 Jan 2014
  • Publish Date: 01 Aug 2014
  • The channel flow model was gradually being accepted with the more important multidisciplinary evidences from geology and geophysics, but how the lower crustal flow influenced the surface deformation quantitatively was unknown. Here, we develop a three-dimensional viscoelastic model to explore the mechanical relations between the lower crustal flow and the surface deformation in western Sichuan. Based on numerous tests, our results show that the modeled results fit well with the observed GPS data when the lower crust flows faster than the upper crust about 11 mm/a in the rhombic block, which can be useful to understand the possible mechanism of the surface deformation in western Sichuan. Moreover, taking the Xianshuihe fault as an example, we preliminarily analyze the relation between the active fault and stress field, according to the boundary constraints that deduced from the best model. The results show that the maximum shear stress on the Xianshuihe fault zone is mainly located in the fault terminal, intersections and the bend of the fault geometry, the stress level on the northwestern segment that has the high slip rate is relatively high. Additionally, with the reduction of the Young's modulus in the fault zone, it's conducive to generate the greater strain distribution, hence forming the high stress level.

     

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