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具有大量较高精度地震震源定位资料的区域内,统计分析地壳介质虚波速度的空间分布可以研究区域地壳结构。本文在长江三峡地区进行了尝试,研究地壳介质径向和横向上的差异。所得虚波速度分层结构与研究区人工爆破得到的P波速度分层结构基本一致。研究区内以黄陵背斜东缘为界,东、西两侧地壳介质平均虚波速度值差异明显。此外,在没有S波速度结构直接研究结果的情况下,本文利用虚波和P波速度结构的结果初步估算并讨论了该区地壳介质各弹性模量参数随深度的变化况情。
With a large number of high-precision seismic source localization data, the statistical analysis of the spatial distribution of the virtual wave velocity in the crust can study the regional crustal structure. This paper attempts to study the difference between the radial and horizontal directions of the crustal medium in the Three Gorges area of the Yangtze River. The obtained virtual wave velocity stratification structure is basically the same as the P wave velocity stratification structure obtained by artificial blasting in the study area. The eastern margin of the Huangling anticline is bounded by the study area, and the difference of the average virtual wave velocity values in the crust medium on the east and west sides is significant. In addition, in the absence of a direct study of the S-wave velocity structure, this paper initially estimates and discusses the variation of various elastic modulus parameters with the depth of the crustal medium based on the results of the pseudo-wave and P-wave velocity structures.