| 东南亚下方核幔边界D″层地震各向异性 |
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| 引用本文： | 罗玉来,何玉梅,赵亮.东南亚下方核幔边界D″层地震各向异性[J].地球物理学报,2016,59(10):3674-3683. |
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| 作者姓名： | 罗玉来 何玉梅 赵亮 |
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| 作者单位： | 1.中国科学院地质与地球物理研究所, 中国科学院地球和行星物理重点实验室, 北京 100029;2.中国科学院地质与地球物理研究所, 岩石圈演化国家重点实验室, 北京 100029 |
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| 基金项目： | 国家自然科学基金（41474042）资助. |
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| 摘 要： | 本文利用中国国家数字地震台网(CDSN)和国际数字地震台网(FDSN)的宽频带远震资料,采用S和ScS震相剪切波差异分裂方法对东南亚下方核幔边界D″层地震各向异性进行研究.共获得了来自7个深震(400km)的24对高质量的S和ScS剪切波分裂参数,其中S震相的分裂参数与前人上地幔各向异性研究结果十分吻合,表明S震相观测结果反映了观测台站下方的上地幔各向异性.通过对上地幔各向异性校正后的波形数据进行进一步的分裂参数分析,最后得到了24个可靠的ScS剩余各向异性分裂参数.结果显示,在经度107°~112°范围内分裂参数均为空值(Null);而在该经度范围东西两侧区域,主要表现为明显分裂特征.这种分裂参数的分布指示了核幔边界D″层的各向异性特征的区域变化,我们推测这种变化可能与停滞在核幔边界的古特提斯和/或古太平洋俯冲板块相关.
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| 关 键 词： | 核幔边界 D"层 地震各向异性 剪切波分裂 S和ScS |
| 收稿时间： | 2016-02-24 |
Seismic anisotropy in the D” layer near the core-mantle boundary beneath Southeast Asia |
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| LUO Yu-Lai,HE Yu-Mei,ZHAO Liang.Seismic anisotropy in the D” layer near the core-mantle boundary beneath Southeast Asia[J].Chinese Journal of Geophysics,2016,59(10):3674-3683. |
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| Authors: | LUO Yu-Lai HE Yu-Mei ZHAO Liang |
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| Institution: | 1.Key Laboratory of Earth and Planetary Physics, Chinese Academy of Sciences, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2.State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | We probe lowermost mantle seismic anisotropy beneath Southeast Asia based on S and ScS differential splitting measurements of the broadband teleseismic data recorded by the Chinese Digital Seismic Network (CDSN) and the International Federation of Digital Seismograph Networks (FDSN). Twenty-four pairs of high-quality S and ScS shear wave splitting parameters from 7 deep events (>400 km) are obtained. Splitting parameters of S phases agree well with previous work, indicating upper mantle anisotropy beneath seismic stations. After correction for the upper mantle anisotropy and further analysis of the splitting parameters, we obtain 24 reliable ScS residual splitting parameters. Our results show Null splitting in the area between 107°~112° while non-Null splitting dominating to the east and west. Our results suggest that the distributions of splitting parameters indicate regional variation of the lowermost mantle anisotropy, which may be related with stagnant ancient Tethys and/or Pacific plates. |
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| Keywords: | Core-mantle boundary D"layer Seismic anisotropy Shear wave splitting S and ScS |
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