| 新疆和周边地区地壳厚度和Vp/Vs比值变化的接收函数约束 |
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| 引用本文： | 刘文学,刘贵忠,周刚,李欣,张慧民,徐恒垒.新疆和周边地区地壳厚度和Vp/Vs比值变化的接收函数约束[J].地球物理学报,2011,54(8):2034-2041. |
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| 作者姓名： | 刘文学 刘贵忠 周刚 李欣 张慧民 徐恒垒 |
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| 作者单位： | 1. 西安交通大学,西安 710049;
2. 西北核技术研究所, 西安 710024 |
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| 基金项目： | 军控核查技术项目(513310101)资助. |
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| 摘 要： | 我们用修订后的接收函数H-K叠加算法估计了新疆和周边地区90个地震台站下的地壳厚度和波速比Vp/Vs.该地区平均地壳厚度约为52 km,变化范围约为33～79 km.最厚地壳位于西昆仑山的TAG台站,最薄地壳在塔拉斯-费尔干那断层附近的NRN台站.对每个台站的点地壳厚度估计结果进行了线性各向同性变差模型的标准克里金空间...
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| 关 键 词： | 新疆和周边地区 接收函数 地壳厚度 波速比 H-k叠加 |
| 收稿时间： | 2010-09-27 |
Crustal thickness and Vp/Vs ratio variations of Xinjiang and surrounding regions constrained by receiver function stacking |
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| LIU Wen-Xue,LIU Gui-Zhong,ZHOU Gang,LI Xin,ZHANG Hui-Min,XU Heng-Lei.Crustal thickness and Vp/Vs ratio variations of Xinjiang and surrounding regions constrained by receiver function stacking[J].Chinese Journal of Geophysics,2011,54(8):2034-2041. |
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| Authors: | LIU Wen-Xue LIU Gui-Zhong ZHOU Gang LI Xin ZHANG Hui-Min XU Heng-Lei |
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| Institution: | 1. Xi'an Jiaotong University, Xi'an 710049,China;
2. Northwest Institute of Nuclear Technology, Xi'an 710024,China |
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| Abstract: | We have estimated crustal thicknesses and Vp/Vs ratios under 90 seismic stations in Xinjiang and its surrounding regions. The technique we used is the modified H-κ stacking method. The average crustal thickness in this region is about 52 km. The crustal thicknesses range from about 33 km to 79 km. The thickest crust is under TAG station, which is situated in the West Kunlun mountains. On the other hand, the thinnest crust is under NRN station, which is near the Talas-Fergana fault. In order to get the map of the crustal thickness variations, the crustal thicknesses under all stations were gridded with standard Kriging technique for a linear isotropic variogram model. The resolution of the gridded map is 0.1°×0.1°, and the map shows strong correlations to the surface topography. The crustal thicknesses under the basin regions are thinner than that under orogenic regions. This implies that the Moho under the basins dip into the orogenic belt. The Vp/Vs ratios range from 1.61 to 1.89, with the average value of 1.76. The complex variation of Vp/Vs ratios characterizes the complex crustal composition of this region. The complex composition of the crust is probably caused by the mantle upwelling. This complexity also implies that underplating may be one of the reasons of the crustal thickening in the study area. |
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| Keywords: | Xinjiang and its surrounding regions Receiver function Crustal thickness Vp/Vs ratio H-κ stacking |
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