太行山山前断裂西南段地壳介质各向异性特征浅析

地震 ›› 2008, Vol. 28 ›› Issue (2): 115-122.

太行山山前断裂西南段地壳介质各向异性特征浅析

吴晶^1,2, 高原¹, 石玉涛¹, 太龄雪¹

1.中国地震局地震预测研究所, 北京 100036;
2.江苏省地震局, 江苏南京 210014

收稿日期:2007-09-17 修回日期:2007-12-06 出版日期:2008-04-30 发布日期:2021-10-29
作者简介:吴晶(1977年-), 女, 江苏徐州人, 2007年获博士学位, 主要从事地球介质各向异性相关等研究。
基金资助:
地震行业科研专项(200708008); 中国地震局地震预测研究所基本科研专项(2007-13)

Seismic anisotropy in crust in southwestern Capital Circle, China

WU Jing^1,2, GAO Yuan¹, SHI Yu-tao¹, TAI Ling-xue¹

1. Institute of Earthquake Science, CEA, Beijing 100036;
2. Earthquake Administration of Jiangsu Province, Nanjing 210014, China

Received:2007-09-17 Revised:2007-12-06 Online:2008-04-30 Published:2021-10-29

摘要/Abstract

摘要： 根据太行山山前断裂西南端, 包括石家庄及其周边地区的位于太行隆起与华北盆地两大地质构造单元交汇处的构造环境复杂情况。该文应用SAM分析方法与首都圈近4年(2002年1月至2005年8月)的观测数据, 分析该区地壳介质各向异性特征。研究结果表明, 太行山山前断裂西南端快剪切波平均偏振方向与华北区域最大主压应力场方向一致, 是区域应力环境的较好描述。该区慢剪切波平均时间延迟比较首都圈西北部和东南部均较小。区内台站的快剪切偏振方向既受到区域构造背景应力环境的作用, 又受到局部的NNE向构造带的制约, 是两者共同作用的结果。井径(JNX)台站的剪切波分裂参数与紧邻台站有明显不同, 其原因有待更多数据加以补充并做细致讨论。

关键词: 剪切波分裂, 快剪切波偏振, 慢剪切波时间延迟, 太行山山前断裂

Abstract: The southwestern system of the Taihang mountain-front fault includes Shijiazhuang city and its adjacent area, which is located in the southwestern Capital Circle and in the cross area between Taihang Uplift and North China Basin, the geological structure is complicated in the area. Based on the SAM method and data (2002.1~2005.8) from Capital Circle Seismic Network, the seismic anisotropy in southwestern Capital Circle is obtained. It is shown that the average polarization of fast shear-wave is consistent with the regional maximum horizontal principal compressional stress, it is an efficient tool to depict regional stress field. The average time delay of slow shear-waves is lower than in northwestern and southeastern Capital Circle. The fast shear-wave polarizations at stations are influenced both by the regional stress field and by the local tectonics with NNE striking direction. The shear-wave splitting parameters at Jingxing station (JNX) are different from the station nearby; more data are needed to explain the phenomenon.

Key words: Shear-wave splitting, Polarization, Time delay, Taihang mountain-front fault

中图分类号:

P315.7

吴晶, 高原, 石玉涛, 太龄雪. 太行山山前断裂西南段地壳介质各向异性特征浅析[J]. 地震, 2008, 28(2): 115-122.

WU Jing, GAO Yuan, SHI Yu-tao, TAI Ling-xue. Seismic anisotropy in crust in southwestern Capital Circle, China[J]. EARTHQUAKE, 2008, 28(2): 115-122.

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