| Azimuthal anisotropy in lithosphere on the Chinese mainland from observations of SKS at CDSN |
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| 引用本文： | 郑斯华,高原.Azimuthal anisotropy in lithosphere on the Chinese mainland from observations of SKS at CDSN[J].地震学报(英文版),1994(2). |
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| 作者姓名： | 郑斯华 高原 |
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| 作者单位： | Center for Analysis and Prediction，State Seismological Bureau，Beijing 100036，China |
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| 摘 要： | Ａｚｉｍｕｔｈａｌ ａｎｉｓｏｔｒｏｐｙ ｉｎ ｌｉｔｈｏｓｐｈｅｒｅ ｏｎ ｔｈｅ Ｃｈｉｎｅｓｅ ｍａｉｎｌａｎｄ ｆｒｏｍ ｏｂｓｅｒｖａｔｉｏｎｓ ｏｆ ＳＫＳ ａｔ ＣＤＳＮ（郑斯华）（高原）Ａｚｉｍｕｔｈａｌａｎｉｓｏｔｒｏｐｙｉｎｌｉｔ...
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Azimuthal anisotropy in lithosphere on the Chinese mainland from observations of SKS at CDSN |
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| Si-Hua ZHENG,and Yuan GAO.Azimuthal anisotropy in lithosphere on the Chinese mainland from observations of SKS at CDSN[J].Acta Seismologica Sinica(English Edition),1994(2). |
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| Authors: | Si-Hua ZHENG and Yuan GAO |
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| Abstract: | The shear wave splitting in SKS are investigated from all available teleseismic data recorded at the broad band stations of China Digital Seismograph Network. The polarization direction of fast S wave of anisotropy and the time delay of slow S wave are determined. Detectable shear wave splitting was found at eight analysed stations of CDSN. Time delay ranges from 0. 7 s to 1. 7 s. The previous work show that the shear wave splitting of SKS which propagate through the mantle is due to the anisotropy in upper mantle. The anisotropy in upper mantle can be interpreted by the strain-induced lattice dominant orientation of mantle minerals. The thickness of the anisotropic layer responsible for SKS wave splitting, which is estimated from time delay, corresponds generally to the thickness of lithosphere beneath Chinese mainland, which is estimated from depth of the high conductivity layer and the low velocity layer in the upper mantle. In most stations, the polarization direction of fast S wave obtained in this study are generally close to these predicted by the deformation of intraplate blocks as a whole. However, there is obvious difference between the two directions at some stations. This suggests that the causes of this well observed phenomenon are clearly complex. In order to interpret the shear wave splitting of mantle shear wave, more high-quality observation and more additional information about the strain in the mantle will be needed. |
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| Keywords: | shear wave splitting SKS phase anisotropy in lithosphere |
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