| 用远震接收函数研究滇西地区的深部结构 |
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| 引用本文： | 贺传松,王椿镛,吴建平.用远震接收函数研究滇西地区的深部结构[J].地震学报,2004,26(3):238-246. |
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| 作者姓名： | 贺传松 王椿镛 吴建平 |
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| 作者单位： | (中国北京100081中国地震局地球物理研究所) |
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| 基金项目： | 国家重点基础研究发展计划(973计划)，中国地震局地球物理研究所项目 |
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| 摘 要： | 滇西地区地处欧亚板块碰撞或俯冲的边界地带，曾受到多期构造运动的影响，其地质环境和构造背景十分复杂，是我国地震活动比较活跃的地区之一. 本文选用国家、地方和流动数字台网的16个台站的远震记录. 其中PASSCAL甚宽频带流动地震台站4个，提取有效接收函数近2 000条. 两条测线的直线距离分别为650 km和450 km， 横切了滇西地区的一些主要构造单元. 研究表明，怒江断裂可能是一条具有俯冲性质的缝合线. 川滇菱形块体东西两侧的分界线¾红河断裂和小江断裂可能是直立的缝合线或碰撞带. 攀西构造带仍具有大陆裂谷的特征，即地表凹陷、上地幔隆起. 滇西地区的构造格局具有一定的规律性，造山带与缝合线相间分布. 滇西地区由北向南地壳厚度渐次减薄，S波速度整体偏低.
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| 关 键 词： | 接收函数& & 反演& & S波速度结构& & 构造关系 |
| 文章编号： | 0253-3782(2004)03-0238-09 |
| 修稿时间： | 2002年11月19 |
A STUDY ON DEEP STRUCTURE USING TELESEISMIC RECEIVER FUNCTION IN WESTERN YUNNAN |
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| He Chuansong,Wang Chunyong,Wu Jianping.A STUDY ON DEEP STRUCTURE USING TELESEISMIC RECEIVER FUNCTION IN WESTERN YUNNAN[J].Acta Seismologica Sinica,2004,26(3):238-246. |
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| Authors: | He Chuansong Wang Chunyong Wu Jianping |
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| Abstract: | Western Yunnan is located at the boundary of collision or underthrusting zone of Eurasian plate and is influenced by many tectonic movements. With very complex geological environment and tectonic background, it is one of the seismically active areas. In the paper, the teleseismic records were selected from 16 national, local and mobile stations, including 4 very wide band mobile stations of PASSCAL. And nearly 2 000 receiver functions were extracted. Two measuring lines are 650 km and 450 km, respectively and across some major tectonic units in Western Yunnan. It is indicated that Nujiang might be a seam characterized by underthrusting. The western and eastern boundaries of Sichuan Yunnan rhombus block, i.e ., Honghe and Xiaojiang faults, might be an erection seam or collision belt. Panxi tectonic zone still has the characteristics of continental rift valley, that is, the surface is hollow and the upper mantle is upwarping. The tectonic situation in Western Yunnan is of certain regulation with the interlacing distribution of orogenic zone and seam. The crustal thickness decreases gradually from the north to the south and the S wave velocity is globally lower here. |
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| Keywords: | receiver function inversion S wave structure tectonic relationship |
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