| Shear wave anisotropy in D＂ region beneath the western Pacific |
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| 引用本文： | 戴志阳,刘斌,王霄翔,查显杰,张虎,杨凤琴.Shear wave anisotropy in D＂ region beneath the western Pacific[J].地震学报(英文版),2007,20(5):489-496. |
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| 作者姓名： | 戴志阳 刘斌 王霄翔 查显杰 张虎 杨凤琴 |
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| 作者单位： | School of Earth and Space Sciences University of Science and Technology of China，School of Earth and Space Sciences University of Science and Technology of China，School of Earth and Space Sciences University of Science and Technology of China，School of Earth and Space Sciences University of Science and Technology of China，School of Earth and Space Sciences University of Science and Technology of China，School of Earth and Space Sciences University of Science and Technology of China，Hefei 230026，China，Hefei 230026，China，Hefei 230026，China，Hefei 230026 China，Hefei 230026 China，Hefei 230026 China |
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| 基金项目： | National Natural Science Foundation of China (40474016). |
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| 摘 要： | Using seismic shear phases from 47 Tonga-Fiji and its adjacent region events recorded by the CENC and IRIS, and from 26 northeast Asia and north Pacific events recorded by IRIS, we studied the shear wave anisotropy in D" region beneath the western Pacific utilizing the ScS-S differential travel time method and obtained the splitting time values between the radial and transverse components of each ScS wave corresponding to each core-mantle boundary (CMB) reflection point. We found that most shear waves involved horizontally polarized shear wave components traveling faster than vertically polarized shear wave components through the D" region. The splitting time values of ScS wave range from ?0.91 s to 3.21 s with an average value of 1.1 s. The strength of anisotropy varies from ?0.45% to 1.56% with an average value of 0.52%. The observations and analyses show that in the D" region beneath the western Pacific the lateral flow is expected to be dominant and the vertical transverse isotropy may be the main anisotropic structure. This structure feature may be explained by the shape preferred orientation of the CMB chemical reaction products or partial melt and the lattice preferred orientation of the lower mantle materials caused by the lateral flow at lowermost mantle.
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| 关 键 词： | 西太平洋地区 地震 剪切波 各向异性 |
| 文章编号： | 1000-9116（2007）05-0489-08 |
| 收稿时间： | 8 May 2007 |
| 修稿时间： | 2007-05-08 |
Shear wave anisotropy in D ” region beneath the western Pacific |
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| Dai Zhi-yang , Liu Bin , Wang Xiao-xiang , Zha Xian-jie , Zhang Hu and Yang Feng-qin.Shear wave anisotropy in D ” region beneath the western Pacific[J].Acta Seismologica Sinica(English Edition),2007,20(5):489-496. |
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| Authors: | Dai Zhi-yang Liu Bin Wang Xiao-xiang Zha Xian-jie Zhang Hu and Yang Feng-qin |
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| Institution: | School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Using seismic shear phases from 47 Tonga-Fiji and its adjacent region events recorded by the CENC and IRIS, and from 26 northeast Asia and north Pacific events recorded by IRIS, we studied the shear wave anisotropy in D" region beneath the western Pacific utilizing the ScS-S differential travel time method and obtained the splitting time values between the radial and transverse components of each ScS wave corresponding to each core-mantle boundary (CMB) reflection point. We found that most shear waves involved horizontally polarized shear wave components traveling faster than vertically polarized shear wave components through the D" region. The splitting time values of ScS wave range from ?0.91 s to 3.21 s with an average value of 1.1 s. The strength of anisotropy varies from ?0.45% to 1.56% with an average value of 0.52%. The observations and analyses show that in the D" region beneath the western Pacific the lateral flow is expected to be dominant and the vertical transverse isotropy may be the main anisotropic structure. This structure feature may be explained by the shape preferred orientation of the CMB chemical reaction products or partial melt and the lattice preferred orientation of the lower mantle materials caused by the lateral flow at lowermost mantle. |
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| Keywords: | anisotropy shear wave splitting D" region ScS phase the western Pacific |
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