| 1991～2002年新疆中强震震源机制解分析 |
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| 引用本文： | 高国英,温和平,聂晓红.1991～2002年新疆中强震震源机制解分析[J].地震,2005,25(1):81-87. |
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| 作者姓名： | 高国英 温和平 聂晓红 |
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| 作者单位： | 新疆维吾尔自治区地震局,乌鲁木齐,830011;新疆维吾尔自治区地震局,乌鲁木齐,830011;新疆维吾尔自治区地震局,乌鲁木齐,830011 |
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| 基金项目： | 国家科技攻关项目;新疆科技厅资助项目 |
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| 摘 要： | 系统给出了1991～2002年新疆44次中强震震源机制解结果。分析结果认为：这一时段新疆主要受NNE向水平挤压应力制约，但还存在较为明显的NW向应力分布，此结果与新疆近SN向的背景应力场有一些差异。近期中强震震源断层具有多样性，表明新疆构造运动的复杂性；不同时期主压应力P轴仰角的变化，与新疆地震活动的强弱交替相关，显示出区域应力场的增强和恢复过程。多种分析结果表明，自1995年开始新疆区域应力场状态发生了较明显的变化。
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| 关 键 词： | 中强震 震源机制解 应力场 P轴仰角 |
| 文章编号： | 1000-3274(2005)01-0081-07 |
| 修稿时间： | 2004年5月10日 |
Analysis of focal-mechanism solution of moderately strong earthquakes in Xinjiang from 1991 to 2002 |
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| GAO Guo-ying,WEN He-ping,NIE Xiao-hong.Analysis of focal-mechanism solution of moderately strong earthquakes in Xinjiang from 1991 to 2002[J].Earthquake,2005,25(1):81-87. |
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| Authors: | GAO Guo-ying WEN He-ping NIE Xiao-hong |
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| Abstract: | In this paper, the authors gave out systemically focal-mechanism solutions for 44 moderately earthquakes in Xinjiang from 1991to 2002. The authors find out that Xinjiang is controlled by the horizontal compressional stress of NNE direction during this period, but the horizontal compressional stress of NW direction also exists clearly. There is a little difference from the background stress, in which the horizontal compressional stress shows a NS direction. During the period, the variety of focal-ruptures of moderately strong earthquakes shows the complexity of tectonic movement in Xinjiang. The change of elevation angles for F axes of principal compressional stress during different periods is associated with alteration of strong and weak seismicity in Xinjiang region. It shows the process that the stress field in Xinjiang built up and resumed. Many types of analyses show that from 1995-1996 the stress filed in Xinjiang has been clearly changed. |
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| Keywords: | Moderately strong earthquake Focal-mechanism solution Stress field Ele- vation angle of P axis |
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