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华北克拉通中西部地区地壳厚度与波速比研究
引用本文:刘琼林,王椿镛,姚志祥,常利军,楼海.华北克拉通中西部地区地壳厚度与波速比研究[J].地球物理学报,2011,54(9):2213-2224.
作者姓名:刘琼林  王椿镛  姚志祥  常利军  楼海
作者单位:中国地震局地球物理研究所,北京 100081
基金项目:国家自然科学基金项目(90914005,40904023)和科技部科技基础性项目(2006FY110100)共同资助.
摘    要:本文使用华北科学台阵和中国国家地震台网164个地震台站记录的远震波形资料,用最大反褶积方法提取接收函数,采用接收函数H-k叠加方法得到了各台站下方的地壳厚度和波速比.研究结果表明,华北克拉通中西部地区的地壳厚度由东向西加深,其中东部的华北平原地区地壳厚度介于30~33 km,中部的燕山—太行地区地壳厚度介于33~40 ...

关 键 词:华北克拉通  接收函数  地壳厚度  波速比
收稿时间:2011-05-06

Study on crustal thickness and velocity ratio in mid-western North China Craton
LIU Qiong-Lin,WANG Chun-Yong,YAO Zhi-Xiang,CHANG Li-Jun,LOU Hai.Study on crustal thickness and velocity ratio in mid-western North China Craton[J].Chinese Journal of Geophysics,2011,54(9):2213-2224.
Authors:LIU Qiong-Lin  WANG Chun-Yong  YAO Zhi-Xiang  CHANG Li-Jun  LOU Hai
Affiliation:Institute of Geophysics, China Earthquake Administration, Beijing 100081,China
Abstract:In this study, broadband seismic records from 164 digital seismic stations of the North China Seismic Array and the China Digital Seismic Network were used to compute crustal thickness and velocity ratio (Vp/Vs) using the receiver function method and H-k stack. The results show that the crustal thickness of mid-western North China Craton deepens from east to west, the thickness is about 30~33 km in eastern plain area, 33~40 km in Yanshan-Taihangshan area and 40~42 km in Ordos block. The results also demonstrate that the correlation between the crustal average velocity ratio and the crustal thickness is not obvious, which may be related with intensive lateral variety of crustal thickness and crustal composition in the research area. The crustal average velocity ratio is about 1.68~1.86, it is mostly between 1.70 and 1.80 and changes slightly in the eastern plain area; and it is mainly between 1.70 and 1.77 in the mountain area, which suggests that the crustal composition of the mountain area has more felsic matters and lacks mafic minerals. In the research area, the relevance between the crustal thickness and the elevation is distinct, the slope is 6.6, which is higher than that in eastern Tibetan Plateau. The study results indicate that the rock density of the top of upper mantle in mid-western North China Craton is comparatively lower, and the craton is an ancient, low density, refractory craton with rich magnesium and poor iron composition, which can provide a greater buoyancy for the crust.
Keywords:North China Craton  Receiver function  Crustal thickness  Velocity ratio
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