| 中国大陆及邻区海域地壳上地幔各向异性研究 |
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| 引用本文： | 彭艳菊, 黄忠贤, 苏伟, 郑月军. 中国大陆及邻区海域地壳上地幔各向异性研究[J]. 地球物理学报, 2007, 50(3): 752-759, |
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| 作者姓名： | 彭艳菊 黄忠贤 苏伟 郑月军 |
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| 作者单位： | 1 中国地震局地壳应力研究所, 北京100085 2 中国地震局地球物理研究所,北京100081 |
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| 基金项目： | 中国科学院知识创新工程项目，地震科学联合基金，国家自然科学基金 |
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| 摘 要： | 利用分别由Love波和Rayleigh波得到的S波速度结构的差值（VSH-VSV）对中国大陆及邻区海域（70°E～145°E，15°N～55°N）地壳上地幔中的偏振各向异性进行研究.初步研究结果表明，各向异性在空间分布上存在不均匀性：（1）在小于150 km的深度范围内，VSH>VSV的各向异性体占主导地位，反映出在地球的浅部岩石圈内的水平应力作用及软流圈顶部物质的水平向流动对各向异性的形成起主导作用.在大陆地区，各向异性的强度随深度有显著变化.上地壳和上地幔盖层中的各向异性普遍较弱，而在流变性较强的下地壳和软流圈存在较大范围的各向异性.这一现象说明下地壳在岩石圈变形中可能有解耦作用.（2）在大于200 km深度的软流圈下部主要表现为VSHVSV的各向异性比较显著，而软流圈中VSHVSV各向异性.
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| 关 键 词： | 中国大陆及海域 地壳 上地幔 偏振各向异性 |
| 文章编号： | 0001-5733（2007）03-0752-08 |
| 收稿时间： | 2006-01-16 |
| 修稿时间： | 2006-01-16 |
Anisotropy in crust and upper mantle beneath China continent and its adjacent seas |
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| PENG Yan-Ju, HUANG Zhong-Xian, SU Wei, ZHENG Yue-Jun. Anisotropy in crust and upper mantle beneath China continent and its adjacent seas[J]. Chinese Journal of Geophysics (in Chinese), 2007, 50(3): 752-759, |
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| Authors: | PENG Yan-Ju HUANG Zhong-Xian SU Wei ZHENG Yue-Jun |
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| Affiliation: | 1 Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085,China 2 Institute of Geophysics, China Earthquake Administration, Beijing 100081,China |
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| Abstract: | Using the difference of S wave velocity structures derived respectively from Love and Rayleigh waves, the polarization anisotropy in crust and upper mantle beneath China continent and adjacent seas is studied. The result indicates that the distribution of anisotropy is spatially uneven. (1) The V_ SH >V_ SV anisotropy is dominant in the upper 150 km, which indicates that the horizontal stress in shallower lithosphere and the horizontal mass flow in upper asthenosphere are the leading factors in the formation of polarization anisotropy. In the land area the anisotropy intensity changes markedly with depth. The anisotropy in upper crust and upper mantle lid is generally weak, while the anisotropy is intense in the rheologically weak lower crust and asthenosphere, which indicates that the lower crust may decouple in the lithosphere deformation. (2) V_ SH V_ SV anisotropy is more prominent in lithosphere and V_ SH V_ SV anisotropy is the result of the collision and compression between India plate and Eurasian continent which makes the mantle material recrystalize in preferred orientation. |
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| Keywords: | China continent and adjcent seas Crust Upper mantle Polarization anisotropy |
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