| 西藏高原亚东至当雄地带二维地壳结构的研究 |
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| 引用本文：尹周勋,滕吉文,刘宏兵.1990.西藏高原亚东至当雄地带二维地壳结构的研究[J].地球学报,11(2):238-245. |
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| 中文摘要:本文采用中国科学院地球物理研究所1977年在西藏高原取得的人工地震资料，并根据国家自然科学基金项目、地质矿产部重点课题“亚东—格尔木地学断面”的要求，对亚东至当雄地带进行了二维地壳结构的处理和研究。除论文发表的部分结果外，对尚未发表的纳木湖至羊卓雍湖地带的两条相遇地震剖面记录图进行了研究，并采用Pg震相进行了浅层结构的处理。
研究结果给出了亚东至当雄地带的二维地壳结构和速度分布，该地带内地壳厚度为70 km左右，由康马往南地壳厚度逐渐变薄，地壳内存在有两个低速层。地壳浅层结构研究表明：莎马达附近有一条深断裂存在，是南喜马拉雅和北喜马拉雅的分界线，并存在着雅鲁藏布江断裂和当雄断裂，且有向深部延伸的趋势。利用该区纵波研究了Q值，并给出计算结果，综合该地区地壳结构和速度分布，并结合当雄地震区、羊八井地热田进行了研究。 |
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| THE 2-D CRUSTAL STRUCTURE STUDY IN THE YADONG-DAMXUNG REGION OF THE XIZANG PLATEAU |
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| Abstract:In the paper, under the demand of the important project "the GGT from Yadong to Golmud" sponsoredby the Ministry of Geology and Mineral Resources and Supported by the National Natural Science Foundation of China, we have made some detailed studies of the 2-D crustal structure of the belt from Yadang to Domxung based on the DSS obtained by the Geophysical Institute of Academia Sinica in 1977. Besides the results in the thesis[ 1]，two intersecting seismic sections in the region from Nam lake to Yamzho lake, whose results have not been published, were first studied, and the shallow crustal structure was analyzed with Pg phase.
In the study area, the crust has a thinkness of 70 km or so, gradually decreasing from angmar to its south, in which exist two love velocity layers. The result also shows that there are three faults in this region：one is exists near Kangmar and it is a structural demarcation line between the south and the north Himalayas and the other two are the Yarlung Zangbo River fault and the Damxung fault.
In addition, P wave was used to calculate Q values, and the study was conducted taking into account the crustal structure and velocity distribution in the region and in combination with the Damxung earthquake region as well as the Yanbajing geothermal field. |
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