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-  2017 

基于地壳介质各向异性分析湖北及周边地区应力特征
Tectonic Stress Analysis Based on Crustal Seismic Anisotropy in Hubei and Its Surrounding Areas

DOI: 10.3969/j.issn.1000-0844.2017.02.0278

Keywords: 湖北及周边,地震各向异性,剪切波分裂,构造应力
Hubei and the surrounding areas
,seismic anisotropy,shear-wave splitting,tectonic stress

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Abstract:

利用湖北及周边地区数字地震台网2007年12月1日-2013年12月31日的地震观测波形资料,使用剪切波分裂SAM系统分析方法,获得了该地区18个数字地震台站的快剪切波偏振结果。结果表明,湖北地区少部分地震存在S波分裂现象,18个台站的快剪切波偏振优势方向为NE、近NS方向,并明显的第一优势偏振方向,说明该区台站应力场可能为区域构造背景应力环境与局部断裂诱导的各向异性综合效应;复杂的局部构造会影响剪切波分裂结果,造成偏振优势方向与主要活动断裂走向不一致或与区域主压应力相差较大的现象。
In this paper, Seismological Network (2007-12-01-2013-12-31) data from Hubei and its surrounding areas are analyzed via the seismic anisotropy method. Shear-wave splitting parameters from 16 stations are obtained. The results show some S-wave splitting phenomena in Hubei and its surrounding areas, and that the dominant directions of fast shear-wave polarization are the northeast and or nearly northsouth directions and there is no first advantage of polarization direction obviously. The stress field of the stations may be the comprehensive result of regional tectonic background stress environments and induced local fractures. Complex local structures may affect the shear-wave splitting results by reducing the dominant polarization direction, which is not in accordance with the strike of the main active faults. Significant differences between the regional principal compressive stress and dominant polarization direction may also affect the results.

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