| 基于地壳介质各向异性分析湖北及周边地区应力特征 |
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| 引用本文： | 赵凌云,高原,太凌雪,申学林,魏贵春.基于地壳介质各向异性分析湖北及周边地区应力特征[J].西北地震学报,2017,39(2):278-284,300. |
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| 作者姓名： | 赵凌云 高原 太凌雪 申学林 魏贵春 |
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| 作者单位： | 中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;三峡工程生态与环境监测系统地震监测重点站, 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071,中国地震局地震预测研究所, 北京 100036,中国地震局地震预测研究所, 北京 100036,中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;三峡工程生态与环境监测系统地震监测重点站, 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071,中国地震局地震研究所(地震大地测量重点实验室), 湖北 武汉 430071;三峡工程生态与环境监测系统地震监测重点站, 湖北 武汉 430071;湖北省地震局, 湖北 武汉 430071 |
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| 基金项目： | 中国地震局星火计划项目（XH15029YSX） |
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| 摘 要： | 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,并无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。
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| 关 键 词： | 湖北及周边 地震各向异性 剪切波分裂 构造应力 |
| 收稿时间： | 2016/1/25 0:00:00 |
Tectonic Stress Analysis Based on Crustal Seismic Anisotropy in Hubei and Its Surrounding Areas |
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| ZHAO Ling-yun,GAO Yuan,TAI Lin-xue,SHEN Xue-lin and WEI Gui-chun.Tectonic Stress Analysis Based on Crustal Seismic Anisotropy in Hubei and Its Surrounding Areas[J].Northwestern Seismological Journal,2017,39(2):278-284,300. |
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| Authors: | ZHAO Ling-yun GAO Yuan TAI Lin-xue SHEN Xue-lin and WEI Gui-chun |
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| Institution: | Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China;Key Seismic Monitoring Station of the Three Gorges Project Ecological and Environmental Monitoring System,Wuhan 430071, Hubei,China,Earthquake Administration of Hubei Province, Wuhan 430071, Hubei, China,Earthquake Administration of Hubei Province, Wuhan 430071, Hubei, China,Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China;Key Seismic Monitoring Station of the Three Gorges Project Ecological and Environmental Monitoring System,Wuhan 430071, Hubei,China and Key Laboratory of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, Hubei, China;Institute of Earthquake Science,China Earthquake Administration,Beijing 100036,China;Key Seismic Monitoring Station of the Three Gorges Project Ecological and Environmental Monitoring System,Wuhan 430071, Hubei,China |
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| Abstract: | 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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| Keywords: | Hubei and the surrounding areas seismic anisotropy shear-wave splitting tectonic stress |
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