地震地质 ›› 2004, Vol. 26 ›› Issue (1): 153-160.

• 研究论文 • 上一篇    下一篇

利用反演方法确定新疆伽师地震的定位

潘素珍1,2, 张先康2, 杨卓欣2, 张成科2, 段永红2, 赵金仁2, 嘉士旭2   

  1. 1. 中国科学技术大学地球和空间科学学院, 合肥, 230026;
    2. 中国地震局地球物理勘探中心, 郑州, 450002
  • 收稿日期:2003-04-20 修回日期:2003-09-24 出版日期:2004-03-04 发布日期:2009-10-26
  • 作者简介:潘素珍,女,1975年生,在读硕士研究生,工程师,主要从事深部地震测深和浅层地震资料的处理和研究工作,电话:0371-3922214,Email:panszh@163.net.

PRECISE LOCATING OF JIASHI, XINJIANG EARTHQUAKE BY USING INVERSION METHOD

PAN Su-zhen1,2, ZHANG Xian-kang2, YANG Zhuo-xin2, ZHANG Cheng-ke2, DUAN Yong-hong2, ZHAO Jin-ren2, JIA Shi-xu2   

  1. 1. University of Science and Technology of China, Hefei 230026, China;
    2. Research Center of Exploration Geophysics, China Earthquake Adm
  • Received:2003-04-20 Revised:2003-09-24 Online:2004-03-04 Published:2009-10-26

摘要: 运用一种广义反演方法,在任意垂向非均匀介质中,根据近震P,S波到时来确定地震事件空间位置的概率分布,应用此方法对新疆伽师地区临时数字地震台网的资料进行了定位处理,发现所定位的地震在平面图上呈明显的NNW向和NNE向线性分布,其中NNW向趋势略为明显.同时讨论了伽师地震的深部构造背景,对伽师地区天然地震的定位结果显示了地震与断裂的密切关联,该震群的形成与震源区附近的隐伏断裂有关,这可能是塔里木盆地北缘的地壳剧烈变形及现今构造运动所造成的结果,这些复杂的构造格局和特殊环境为伽师强震群的孕育和发生提供了条件.

关键词: 地震定位, 广义反演, 伽师地震

Abstract: Jiashi region, Xinjiang is a strong earthquake area in western China. In recent years, several great earthquake swarms have occurred in this region, causing tremendous hazards. In order to get an insight into the relation between the deep structures and the generation of great earthquake swarm in this region, a generalized inversion technique for determining probability distributions of spatial locations of earthquake events through the travel times of P and S waves in random and vertically inhomogeneous medium, is used in this paper. Seismic data recorded by temporal digital seismic network deposed in this region were located using this method. The located earthquakes show linear distribution in north-northwest and north-northeast directions, among which the former is more distinct than the later. Based on the obtained results, the deep structural background of seismic activities in Jiashi region is discussed. The results indicate also the close relation between the earthquake and fault structures in Jiashi region. It is clear that the generation of earthquake swarm might be related to the buried fault in the vicinity of seismic source area, and might be the result of violent crustal deformation on the northern margin of Tarim basin and the present tectonic movement. These complicated structural framework and peculiar environmental conditions might be responsible for the development and generation of the strong earthquake swarm in Jiashi region.

Key words: earthquake location, generalized inversion, Jiashi earthquake

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