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地震 ›› 2005, Vol. 25 ›› Issue (1): 81-88.

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1991～2002年新疆中强震震源机制解分析

高国英, 温和平, 聂晓红   

  1. 新疆维吾尔自治区地震局, 乌鲁木齐 830011
  • 收稿日期:2004-05-10 修回日期:2004-08-12 出版日期:2005-01-31 发布日期:2021-11-10
  • 作者简介:高国英(1953-), 女, 新疆巴里坤人, 研究员, 主要从事地震预报等研究。
  • 基金资助:
    “十五”国家科技攻关项目(2001BA601B01-03-03); 新疆自治区科技厅项目(200333116)资助

Analysis of focal-mechanism solution of moderately strong earthquakes in Xinjiang from 1991 to 2002

GAO Guo-ying, WEN He-ping, NIE Xiao-hong   

  1. Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumchi 830011, China
  • Received:2004-05-10 Revised:2004-08-12 Online:2005-01-31 Published:2021-11-10

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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。

关键词: 中强震, 震源机制解, 应力场, P轴仰角

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 P 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.

Key words: Moderately strong earthquake, Focal-mechanism solution, Stress field, Elevation angle of P axis

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