Effects of tectonic stress field and Poisson’s ratio on stress state within the San Andreas Fault zone
Effects of tectonic stress field and Poisson’s ratio on stress state within the San Andreas Fault zone
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DOI：
10.1007/s11434-014-0216-7
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发表时间：
2014-03
影响因子：
--
通讯作者：
Zhoumin Xie;Yongen Cai
中科院分区：
文献类型：
--
作者：
Zhoumin Xie;Yongen Cai
We used a mechanics conceptual model to provide another perspective to understand the mechanical environment of the San Andreas Fault (SAF), and a possible mechanism that the principal stress state in the SAF is not only affected by remote tectonic stress but also by Poisson’s ratio. For a strike-slip fault like the SAF, we found that in the fault zone with Poisson’s ratio of >0.25, effective friction coefficient and the stress ratio (minimum principal stress/maximum principal stress) are less than 0.1 and 0.8–1.0, respectively, corresponding to remote tectonic stress ratio of 0.36–1.0, and that the higher the Poisson’s ratio, the greater the principal stress rotates. For hydrostatic pore pressure and a received tectonic stress ratio of 0.5 around the SAF, the model predicts that the SAF has a very high Poisson’s ratio (~0.45), which accommodates extremely low effective friction coefficient (0.09) and large stress ratio (0.84) or smaller shear stress (17 MPa).
