| 三峡水库坝址及邻区中上地壳S波速度结构 |
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| 引用本文： | 李强,赵旭,蔡晋安,刘瑞丰.三峡水库坝址及邻区中上地壳S波速度结构[J].地震学报,2011,33(1):39-50. |
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| 作者姓名： | 李强 赵旭 蔡晋安 刘瑞丰 |
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| 作者单位： | 1）中国北京100037地壳运动监测网络工程研究中心 2）中国北京100045中国地震台网中心 3）中国北京100036中国地震局地震预测研究所 |
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| 基金项目： | 国家自然基金项目(40574039); 国家科技支撑计划重点项目(2008BAC38B02)资助 |
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| 摘 要： | 利用三峡数字地震台网记录的Sg波到时资料,采用地震层析成像技术,重建了三峡水库坝址及邻区中上地壳的三维速度图象,研究了地壳深部构造,主要结论是:①黄陵背斜的岩性具有固结程度高、岩体均匀完整、埋藏深度至少达14 km的特征;②秭归盆地与边缘构造由于岩层一致,而速度结构相同;构造变形的强度决定了秭归盆地及周缘区域沉积层的厚...
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| 关 键 词： | 三峡水库 中上地壳 S波速度结构 |
S-wave velocity structure of upper and middle crust beneath the Three Gorges reservoir dam and adjacent region |
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| Li Qiang,Zhao Xu,Cai Jinan,Liu Ruifeng.S-wave velocity structure of upper and middle crust beneath the Three Gorges reservoir dam and adjacent region[J].Acta Seismologica Sinica,2011,33(1):39-50. |
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| Authors: | Li Qiang Zhao Xu Cai Jinan Liu Ruifeng |
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| Affiliation: | 1）National Earthquake Infrastructure Service, Beijing 100037, China2）China Earthquake Network Center, Beijing 100045, China3）Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China |
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| Abstract: | A 3-D S-wave velocity structure of upper and middle crust beneath the Three Gorges reservoir dam and in adjacent region was reconstructed by means of the seismic tomography using the absolute Sg-arrivals from the earthquakes observed by the Three Gorges seismic network. Main research results of the crustal structure are as follows.①The lithology of the Huangling anticline is highly solidified, with uniformity and integrity. Its buried depth is not less than 14 km. ②The rock strata of the Zigui basin are consistent with that of its marginal region, so their velocity structures are the same. The depth distribution and velocity structure characteristics of the Zigui basin and its adjacent areas depended on the intensity of the tectonic deformation.③The partially molten substances, located in upper and middle crust and intruded from upper mantle,mainly distribute beneath the Zigui basin, as well as nearby the Peishi region.④The crystalline basement was constructed inhomogeneously, its top and bottom boundary, and the basement thickness and corresponding velocity structure, show significant regional variation.⑤The velocity gradient zone is generally consistent with the gravitational gradient zone. |
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| Keywords: | Three Gorges reservoir upper and middle crust S-wave velocity structure |
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