| 用剪切波分裂研究台湾北部地壳各向异性 |
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| 引用本文： | 太龄雪,高原,马国鳯,李恩慈,石玉涛,林欣儀.用剪切波分裂研究台湾北部地壳各向异性[J].地球物理学报,2011,54(9):2233-2242. |
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| 作者姓名： | 太龄雪 高原 马国鳯 李恩慈 石玉涛 林欣儀 |
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| 作者单位： | 1. 中国地震局地震预测研究所,北京 100036;
2. "台湾中央大学",桃园中坜 32001 |
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| 基金项目： | 国家自然科学基金(40774022)资助. |
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| 摘 要： | 研究主要使用台湾北部13个地震台站记录到的1991年7月～2002年12月的波形数据,采用剪切波分裂SAM分析方法,对台湾北部地区的剪切波分裂特征进行了研究.发现位于宜兰盆地内的台站的快剪切波优势偏振方向为近E-W方向,而位于山脉(西部麓山带、雪山山脉和中央山脉)的台站的快剪切波优势偏振方向为NNE向或NE方向.位于海...
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| 关 键 词： | 剪切波分裂 台湾北部 地壳地震各向异性 快剪切波偏振方向 主压应力 时间延迟 |
| 收稿时间： | 2010-06-05 |
Crustal anisotropy in north Taiwan from shear-wave splitting |
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| TAI Ling-Xue,GAO Yuan,MA Kuo-Fong,Lee En-T zu,SHI Yu-Tao,Lin Hsin-I.Crustal anisotropy in north Taiwan from shear-wave splitting[J].Chinese Journal of Geophysics,2011,54(9):2233-2242. |
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| Authors: | TAI Ling-Xue GAO Yuan MA Kuo-Fong Lee En-T zu SHI Yu-Tao Lin Hsin-I |
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| Institution: | 1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036,China;
2. Taiwan Central University, Taiwan 32001,China |
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| Abstract: | Using the seismic data recorded by 13 seismic stations in north Taiwan from July 1991 to December 2002, this study analyzes the feature of shear-wave splitting in north Taiwan by SAM method of shear-wave splitting. The results show that predominant polarization directions of fast shear-waves at Yilan basin strikes to nearly E-W, while polarization directions at mountain ranges (Western Foothill, Hsüeshan Range and Central Range) are in NNE or NE direction. Polarizations are scattered if the stations are on seashore or on island, and often have two predominant polarizations, which may be caused by irregular topography or complicated local tectonics. From the spatial distribution of time delays, we also find that taking station TWE as a boundary, time delays at station TWE and north of the station are longer than those at south of the station. It possibly suggests that anisotropy at station TWE and north of the station are stronger than anisotropy at south of the station. |
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| Keywords: | Shear-wave splitting North Taiwan Crust seismic anisotropy Polarization direction of fast shear-wave Principal compressive stress Time delay |
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