| 华北地区Lg尾波衰减研究——Lg尾波Q0地震成像 |
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| 引用本文： | 刘建华,刘福田,阎晓蔚,胥颐,郝天珧.华北地区Lg尾波衰减研究——Lg尾波Q0地震成像[J].地球物理学报,2004,47(6):1044-1052. |
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| 作者姓名： | 刘建华 刘福田 阎晓蔚 胥颐 郝天珧 |
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| 作者单位： | 中国科学院地质与地球物理研究所，北京 100029 |
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| 基金项目： | 中国科学院重大基金项目 (KZCX1 SW 18 0 1)，国家自然科学基金项目 ( 4 99740 0 4)资助 |
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| 摘 要： | 利用单台记录叠加频谱比法测量出的华北地区560余条单台传播路径上平均Lg尾波Q0值数据（Q0是1Hz的Q值），采用随机褶积模型和奇异值分解法，重建该地区地壳中Q0的横向变化.结果表明，华北地区地壳中Lg尾波Q0值分布具有显著的横向不均匀性，这种不均匀性与地质构造明显相关，块隆区具有较高的Q0值，例如，燕山造山带、太行山块隆、鲁西隆起；华北平原区表现为低Q0值分布，例如冀中坳陷、黄骅坳陷、济阳坳陷，二者界限分明.结合研究区内的大地热值分布研究表明，低Q0值区大都处于高热流区，这可能是地壳内热物质的活动有关.虽然华北地区Lg尾波Q0值高、低分区明显，但是，从总体上应该属于低Q0值异常区，也就是说，该区的地壳是高地震波衰减区，这可能是该地区受太平洋板块和欧亚板块的相互作用而使地壳减薄，热物质上升造成的结果.
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| 关 键 词： | 华北地区 Lg尾波 Lg尾波Q0 地震波衰减成像 横向不均匀性 |
| 文章编号： | 0001-5733(2004)06-1044-09 |
| 收稿时间： | 2003-8-7 |
| 修稿时间： | 2004-6-4 |
A STUDY OF LG CODA ATTENUATION BENEATH NORTH CHINA: SEISMIC IMAGING OF LG CODA Q0 |
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| LIU Jian-Hua LIU Fu-Tian YAN Xiao-Wei XU Yi HAO Tian-Yao Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing ,China.A STUDY OF LG CODA ATTENUATION BENEATH NORTH CHINA: SEISMIC IMAGING OF LG CODA Q0[J].Chinese Journal of Geophysics,2004,47(6):1044-1052. |
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| Authors: | LIU Jian-Hua LIU Fu-Tian YAN Xiao-Wei XU Yi HAO Tian-Yao Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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| Abstract: | By using 560 Lg coda Q 0 values measured on propagating paths, the Q 0 image in the crust beneath the North China region is restructured with a stochastic modeling and the singular value decomposition. The result indicates that there is remarkable lateral heterogeneity on Lg coda Q 0 distribution in the crust beneath the North China region, similar to the velocity image, and closely related with the known surface geological features: the low Q 0 areas exist beneath the Taihang and Yanshan mountains and the Luxi uplift area, and high Q 0 values appear below the Jizhong, Huanghua and Jiyang depressions and the plain areas. There is a clear division between the high and low Q 0 values. Compared with the heat flow values in North China, most the low Q 0 value areas are located in the high heat flow areas. It is possibly related with hot material activity in the crust below these areas. Although there is a clear difference between the high and low Q 0 value areas in the crust of North China, as a whole the North China belongs in low Q 0 value abnormal region. It means that the region is a high seismic wave attenuation area. Probably it is resulted from the interaction between Eurasia and Pacific plates, which causes the crust thinning and hot material upwelling. |
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| Keywords: | North China Lg coda Lg coda Q 0 Image of the seismic wave attenuation Lateral heterogeneity |
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