| Crack－induced anisotropy in the crust from shear wave splitting observed in Tangshan region，North China |
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| 引用本文： | 高原,郑斯华,孙勇.Crack－induced anisotropy in the crust from shear wave splitting observed in Tangshan region，North China[J].地震学报(英文版),1995,8(3):351-363. |
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| 作者姓名： | 高原 郑斯华 孙勇 |
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| 作者单位： | Yuan GAO; Si-Hua ZHENG;and Yong SUN (Center for Analysis and Prediction，State Seismological Bureau，Beijing 100036，China)(Seismological Bureau of Liaoning Prouince，Shenyang 110031，China) |
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| 摘 要： | Ｃｒａｃｋ－ｉｎｄｕｃｅｄａｎｉｓｏｔｒｏｐｙｉｎｔｈｅｃｒｕｓｔｆｒｏｍｓｈｅａｒｗａｖｅｓｐｌｉｔｔｉｎｇｏｂｓｅｒｖｅｄｉｎＴａｎｇｓｈａｎｒｅｇｉｏｎ，ＮｏｒｔｈＣｈｉｎａＹｕａｎＧＡＯ（高原）Ｓｉ－ＨｕａＺＨＥＮＧ；（郑斯华）ａｎｄＹｏｎｇ...
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| 收稿时间： | 14 April 1994 |
| 修稿时间： | 17 August 1994 |
Crack-induced anisotropy in the crust from shear wave splitting observedinTangshan region,North China |
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| Yuan GAO, Si-Hua ZHENG,and Yong SUN.Crack-induced anisotropy in the crust from shear wave splitting observedinTangshan region,North China[J].Acta Seismologica Sinica(English Edition),1995,8(3):351-363. |
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| Authors: | Yuan GAO Si-Hua ZHENG and Yong SUN |
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| Institution: | (1) Center for Analysis and Prediction, State Seismological Bureau, 100036 Beijing, China;(2) Seismological Bureau of Liaoning Province, 110031 Shenyang, China;(3) Present address: Department of Earth Sciences, University of Western Ontario, N6A5B7, Ontario, Canada |
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| Abstract: | Using the cross correlation function analysis method, this paper discusses shear wave splitting and crack-inducedanisotropy in the crust beneath Tangshan, North China, by the digital data from Tangshan strong ground monon temporary arrays. Sixteen of twenty-one stations in the arrays recorded earthquake events available forstudying from 1982 to 1984. Having calculated 131 available records, we get slower shear wave time delay r andfaster shear wave polarization azimuth Paz in Tangshan region, and the cracks density s is got further fromthem. The analysis shows that the stress field is very complicated in Tangshan region and has strongly regionalfeature. Because of the complicated distribution of faults, different shear wave splitting characteristics are shownin 16 stations, scattered r and different Paz. And they also were observed that the r and PaZ values were diversewithin the time scale of hours in more than one station. In Tangshan region the average results of r, Paz and Bare 0. 0071 s. km-1, northwest-west near to east-west and 0.022 respectively. Meantime, the standard devia.tions were calculated in this paper. |
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| Keywords: | crack anisotropy Tangshan cross-correlation function shear wave splitting |
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