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Compressive stress field in the crust deduced from shear-wave anisotropy: an example in capital area of China

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【Author】 GAO Yuan1 & WU Jing1,2 1 Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China; 2 Earthquake Administration of Jiangsu Province, Nanjing 210014, China

【摘要】 The rocks in the crust are pervaded by stress-aligned fluid-saturated microcracks, and the complex fault tectonics and stress control the configuration of the microcracks, however shear-wave splitting could indicate this kind of characteristics. In this paper, Capital Area Seismograph Network (CASN), the widest scope and highest density of regional seismograph network presently in China, is adopted to deduce the principal compressive stress field distribution pattern from polarizations of fast shear- waves, based on shear-wave splitting analysis. The principal compressive stress in capital area of China is at NE85.7°± 41.0° in this study. Compared with the results of principal compressive stress field in North China obtained from other methods, the results in this study are reliable in the principal com- pressive stress field distribution in capital area. The results show that it is an effective way, although it is the first time to directly obtain crustal stress field from seismic anisotropy. It is effectively applied to the zones with dense seismograph stations.

【Abstract】 The rocks in the crust are pervaded by stress-aligned fluid-saturated microcracks, and the complex fault tectonics and stress control the configuration of the microcracks, however shear-wave splitting could indicate this kind of characteristics. In this paper, Capital Area Seismograph Network (CASN), the widest scope and highest density of regional seismograph network presently in China, is adopted to deduce the principal compressive stress field distribution pattern from polarizations of fast shear- waves, based on shear-wave splitting analysis. The principal compressive stress in capital area of China is at NE85.7° ± 41.0° in this study. Compared with the results of principal compressive stress field in North China obtained from other methods, the results in this study are reliable in the principal com- pressive stress field distribution in capital area. The results show that it is an effective way, although it is the first time to directly obtain crustal stress field from seismic anisotropy. It is effectively applied to the zones with dense seismograph stations.

【基金】 the National Natural Science Foundation of China (Grant No. 40674021);IES-CEA Project (Grant No. 2007-13)
  • 【文献出处】 Chinese Science Bulletin ,科学通报(英文版) , 编辑部邮箱 ,2008年18期
  • 【分类号】P553
  • 【被引频次】16
  • 【下载频次】28
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