| 云南地区地壳中上部横波速度结构研究 |
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| 引用本文： | 何正勤,叶太兰,苏伟.云南地区地壳中上部横波速度结构研究[J].地球物理学报,2004,47(5):838-844. |
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| 作者姓名： | 何正勤 叶太兰 苏伟 |
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| 作者单位： | 中国地震局地球物理研究所，北京 100081 |
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| 基金项目： | 地震科学联合基金项目 ( 10 10 86)，中国地震局重点项目 (中国大陆数字壳幔结构 ) |
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| 摘 要： | 根据云南地区的基阶瑞利波相速度频散资料，用面波层析成像方法反演得到该区域中上地壳S波速度结构. 给出了研究区域内在4个深度上的S波速度水平分布图像和沿100.5°E、24°N、25°N、26°N及27°N的S波速度-深度剖面图. 结果表明：在小江断裂与红河断裂围成的川滇菱形块体内，26～30km深度处的速度明显低于周边地区，其南段从地表到15km深度均为明显的低速区域. 云南地区的强震（M＞6.0）震中位置与S波速度分布图像具有明显的相关性，主要分布于高速与低速的过渡区域.
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| 关 键 词： | 瑞利波相速度 层析成像 S波速度结构 云南地区 |
| 文章编号： | 0001-5733(2004)05-0838-07 |
| 收稿时间： | 2003-11-4 |
| 修稿时间： | 2004-6-14 |
S-WAVE VELOCITY STRUCTURE OF THE MIDDLE AND UPPER CRUST IN THE YUNNAN REGION |
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| HE Zheng-Qin YE Tai-Lan SU Wei Institute of Geophysics,China Earthquake Administration,Beijing ,China.S-WAVE VELOCITY STRUCTURE OF THE MIDDLE AND UPPER CRUST IN THE YUNNAN REGION[J].Chinese Journal of Geophysics,2004,47(5):838-844. |
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| Authors: | HE Zheng-Qin YE Tai-Lan SU Wei Institute of Geophysics China Earthquake Administration Beijing China |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | The dispersion data of phase velocities of the fundamental mode Rayleigh wave are used in this paper, the S wave velocity structure of the middle and upper crust in Yunnan region is inverted. The horizontal distribution maps of S wave velocities at four depths and S wave velocities on profiles along 24°N, 25°N, 26°N, 27°N and 100.5°E in the study region are given. The results show that within the range of 26～30km depth, the S wave velocity in the Sichuan Yunnan rhombic block is obviously lower than that in surrounding areas; In the south rhombic block, there is a low velocity region to exist in the range from ground surface to 15km depth. The epicentral locations of strong earthquakes with M＞6.0 in Yunnan region are closely related to the S wave velocity distribution. They are mainly distributed in zones of transition between low and high velocities. |
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| Keywords: | Phase velocity of Rayleigh waves Tomographic imaging S-wave velocity structure Yunnan region |
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