| 渭河断陷地壳三维S波速度结构和VP/VS分布图像 |
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| 引用本文： | 丁韫玉,狄秀玲,袁志祥,薛广盈.渭河断陷地壳三维S波速度结构和VP/VS分布图像[J].地球物理学报,2000,43(2):194-202. |
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| 作者姓名： | 丁韫玉 狄秀玲 袁志祥 薛广盈 |
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| 作者单位： | 1. 陕西省地震局,西安,710068
2. 海南省地震局,海口,570003 |
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| 基金项目： | 地震科学联合基金，95208， |
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| 摘 要： | 利用陕西及邻省区域地震台网的观测数据,采用重叠元迭代重建层析成像技术,结合两点快速射线追综,对渭河断陷盆地地壳的S波速度进行了层析反演成像.并利用前期P波速度的研究结果,计算了该地区地壳的VP/VS分布.研究结果表明:(1)S波速度分布两个地区存在强烈的横向不均匀性,其一是陕晋交界的合阳、永济地区,二是铜川、泾阳地区,它们都位于不同构造单元交汇地带,差异运动显著,是新老地层交错的地区.(2)历史强震震中主要分布在S波的高速区及边缘地带;(3)在淳化、耀县、泾阳之间存在VP/VS高值区,最高达2.1.
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| 关 键 词： | 层析成像 渭河断陷 S波速度 |
THREE-DIMENSIONAL SHEAR WAVE VELOCITY STRUCTURE AND DISTRIBUTION IMAGE OF VP/VS BENEATH THE WEIHE FAULT DEPRESSION |
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| DING YUN-YU,DI XIU-LING,YUAN ZHI-XIANG,XUE GUANG-YING.THREE-DIMENSIONAL SHEAR WAVE VELOCITY STRUCTURE AND DISTRIBUTION IMAGE OF VP/VS BENEATH THE WEIHE FAULT DEPRESSION[J].Chinese Journal of Geophysics,2000,43(2):194-202. |
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| Authors: | DING YUN-YU DI XIU-LING YUAN ZHI-XIANG XUE GUANG-YING |
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| Abstract: | Using the seismic data observed by the seismic networks in Shanxi province and neighbor regions, we studied seismic tomographic imaging of the crustal S wave velocity in the Weihe fault basin by overlapping-shear iterative reconstruction method with the two-points fast ray tracing technique. On the basis of the velocity ratio Vp/ Vs in the same region is calculated. The results show that (1) there are two strong lateral no homogenous regions of S wave velocity distribution, one of which is Heyang-Yongji region on the boundary between Shanxi and Shanxi provinces and the other is Tongchuan-Jingyang zone. Those two areas are located in a region where different tectonic units meet, and differential movement is significant and different rock strata are interceded, (2) the historical strong earthquakes occurred mainly in S wave high-velocity regions on their boundaries; (3) a region with high Vp / Vs value (highest of 2.1) is enclosed by the areas of Chunhua, Yaoxian and Jingyang. |
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| Keywords: | Tomographic imaging Weihe fault depression Shear wave velocity |
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