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汶川地震余震序列的地震各向异性
引用本文:石玉涛,高原,赵翠萍,姚志祥,太龄雪,张永久.汶川地震余震序列的地震各向异性[J].地球物理学报,2009,52(2):398-407.
作者姓名:石玉涛  高原  赵翠萍  姚志祥  太龄雪  张永久
作者单位:1. 中国地震局地球物理研究所,北京,100081;中国地震局地震预测研究所,北京,100036
2. 中国地震局地震预测研究所,北京,100036
3. 中国地震局地球物理研究所,北京,100081
4. 四川省地震局,成都,610041
基金项目:中国地震局地震预测研究所基本科研专项基金 
摘    要:利用2008年5月12日汶川地震震源区及周边地震台站记录的余震序列资料,使用剪切波分裂系统分析法,分析了汶川地震发震构造龙门山断裂带及周边地区的地壳各向异性特征,推断了地壳最大主压应力方向及空间分布特征.研究结果表明:大致以安县为界,位于龙门山北东段的台站快剪切波的偏振方向为北东向,与断裂带走向一致;而位于龙门山西南段的台站快剪切波的偏振方向为北西向,与断裂带走向垂直;这个特征同样揭示出龙门山断裂带西南段逆冲、北东段带有明显走滑性质的特征.研究还显示,靠近龙门山与鲜水河、安宁河小江断裂交汇区附近的台站快剪切波的偏振方向表现比较离散,这可能是由震源区局部的复杂地质构造引起,与该地区复杂的主压应力方向特点一致.

关 键 词:汶川地震  剪切波分裂  地震各向异性  应力  余震序列
收稿时间:2008-12-31
修稿时间:2009-2-6

A study of seismic anisotropy of Wenchuan earthquake sequence
SHI Yu-Tao,GAO Yuan,ZHAO Cui-Ping,YAO Zhi-Xiang,TAI Ling-Xue,ZHANG Yong-Jiu.A study of seismic anisotropy of Wenchuan earthquake sequence[J].Chinese Journal of Geophysics,2009,52(2):398-407.
Authors:SHI Yu-Tao  GAO Yuan  ZHAO Cui-Ping  YAO Zhi-Xiang  TAI Ling-Xue  ZHANG Yong-Jiu
Institution:1InstituteofGeophysics,ChinaEarthquakeAdministration,Beijing100081,China2InstituteofEarthquakeScience,ChinaEarthquakeAdministration,Beijing100036,China3EarthquakeAdministrationofSichuanProvince,Chengdu610041,China
Abstract:Using seismic data of the aftershock sequence of the 2008 Wenchuan earthquake recorded by seismic stations in the seismic source and circumjacent areas, with the systemic analysis method of shear-waves splitting, this paper analyzes the anisotropic characteristics in the crust along and around the Longmenshan fault belt, where occurred the Wenchuan earthquake, and obtains the directions of the principal compressive stress field in the crust and their spatial distribution. The results show the following spatial difference: approximately taking Anxian area as a boundary, the polarization directions of fast shear-waves at stations located at the northeast segment of Longmenshan fault belt are in the northeast direction, consistent with the strike of the faults. However, the polarization directions of fast shear-waves at stations located at the southwest segment are in the northwest direction, which is perpendicular to the strike of the faults. This pattern also indicates that the southwest segment of the Longmenshan fault is a thrust fault, and the northeast segment a strike-slip one. In this study, the polarization directions of fast shear-waves are scattered at stations near the intersection area of the Xianshuihe fault, the Longmenshan fault and the Xiaojiang fault. It may be attributed to the local complex geology structure around the seismic source area, and is consistent with the characteristic of the complex direction of the principal compressive stress in this zone.
Keywords:Wenchuan earthquake  Shear-wave splitting  Seismic anisotropy  Stress  Aftershock sequence
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