| Crustal structure beneath Qiangtang and Lhasa terrane from receiver function |
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| 作者姓名： | 李永华 吴庆举 田小波 曾融生 张瑞青 李红光 |
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| 作者单位： | [1]Institute of Geophysics, China Earthquake Administration, Beijing 100081, China [2]Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| 基金项目： | National Natural Science Foundation of China （40274029） and Joint Seismological Science Foundation of China （105096）.Contribution No.06FE3029, Institute of Geophysics, China Earthquake Adminisreation. |
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| 摘 要： | To determine the crustal structure in central Tibet, we used teleseismic waveform data recorded by 18 stations in the INDEPTH-Ⅲ seismic array across the central Tibet from the central Lhasa terrane to the central Qiangtang terrane. The S-wave velocity structures beneath stations are determined by inverting the stacked radial receiver function using the GA method. The first order features in the receiver function are modeled. Our results show that the Moho in Qiangtang is about 8 km shallower than that in Lhasa terrane along the INDEPTH-Ⅲ profile. It maybe suggests the northward subduction of the Lhasa mantle lid beneath the Qiangtang terrane is affected by the India-Asia collision. We conclude that there exist low velocity zone in the middle crust across the northern Lhasa and Qiangtang terrane, which can be related to the high temperature upper mantle beneath that.
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| 关 键 词： | 地壳结构 地震 青藏高原 反应机制 |
| 文章编号： | 1000-9116（2006）06-0633-10 |
| 收稿时间： | 2005-11-02 |
| 修稿时间： | 2006-07-31 |
Crustal structure beneath Qiangtang and Lhasa terrane from receiver function |
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| LI Yong-hua,WU Qing-ju,TIAN Xiao-bo,ZENG Rong-sheng,ZHANG Rui-qing,LI Hong-guang.Crustal structure beneath Qiangtang and Lhasa terrane from receiver function[J].Acta Seismologica Sinica(English Edition),2006,19(6):633-642. |
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| Authors: | LI Yong-hua WU Qing-ju TIAN Xiao-bo ZENG Rong-sheng ZHANG Rui-qing LI Hong-guang |
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| Institution: | 1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | To determine the crustal structure in central Tibet, we used teleseismic waveform data recorded by 18 stations in the INDEPTH-III seismic array across the central Tibet from the central Lhasa terrane to the central Qiangtang terrane. The S-wave velocity structures beneath stations are determined by inverting the stacked radial receiver function using the GA method. The first order features in the receiver function are modeled. Our results show that the Moho in Qiangtang is about 8 km shallower than that in Lhasa terrane along the INDEPTH-III profile. It maybe suggests the northward subduction of the Lhasa mantle lid beneath the Qiangtang terrane is affected by the India-Asia collision. We conclude that there exist low velocity zone in the middle crust across the northern Lhasa and Qiangtang terrane, which can be related to the high temperature upper mantle beneath that. |
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| Keywords: | Tibetan Plateau receiver function low velocity zone crustal thickness |
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