Active tectonics in Taiwan: insights from a 3-D viscous finite element model

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• 作者：Yujun Sun ; Mian Liu ; Shuwen Dong ; Huai Zhang ; Yaolin Shi
• 关键词：Taiwan ; Stress ; Strain rate ; FEM model ; Earthquake
• 刊名：Earthquake Science
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：28
• 期：5-6
• 页码：353-363
• 全文大小：3,174 KB
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• 作者单位：Yujun Sun (1)
  Mian Liu (2) (3)
  Shuwen Dong (4)
  Huai Zhang (2)
  Yaolin Shi (2)
  
  1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China
  2. Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing, 100049, China
  3. Department of Geological Sciences, University of Missouri, Columbia, MO, 65211, USA
  4. Chinese Academy of Geological Sciences, Beijing, 100037, China
  
• 刊物主题：Geophysics/Geodesy;
• 出版者：Springer Berlin Heidelberg
• ISSN：1867-8777

文摘

Taiwan is a young orogenic belt with complex spatial distributions of deformation and earthquakes. We have constructed a three-dimensional finite element model to explore how the interplays between lithospheric structure and plate boundary processes control the distribution of stress and strain rates in the Taiwan region. The model assumes a liberalized power-law rheology and incorporates main lithospheric structures; the model domain is loaded by the present-day crustal velocity applied at its boundaries. The model successfully reproduces the main features of the GPS-measured strain rate patterns and the earthquake-indicated stress states in the Taiwan region. The best fitting model requires the viscosity of the lower crust to be two orders of magnitude lower than that of the upper crust and lithospheric mantle. The calculated deviatoric stress is high in regions of thrust faulting and low in regions of extensional and strike-slip faulting, consistent with the spatial pattern of seismic intensity in Taiwan. Keywords Taiwan Stress Strain rate FEM model Earthquake