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地震 ›› 2008, Vol. 28 ›› Issue (1): 107-113.

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2005年新疆克孜尔震群的重新定位

李志海1, 曲延军1, 马宏生2, 翟世龙3, 吴传勇1   

  1. 1.新疆维吾尔自治区地震局, 新疆 乌鲁木齐 830011;
    2.中国地震局地震预测研究所, 北京 100036;
    3.新疆维吾尔自治区克孜尔水库管理局, 新疆 拜城 842300
  • 收稿日期:2007-07-27 修回日期:2007-10-16 出版日期:2008-01-31 发布日期:2021-10-29
  • 作者简介:李志海(1978-), 男, 山东潍坊人, 助理研究员, 主要从事地震定位、 数字地震学等研究。
  • 基金资助:
    中国地震局国家科技支撑项目子专题(2006BAC01B02-01-02)

Relocating the kezir earthquake swarm occurred in 2005

LI Zhi-hai1, QU Yan-jun1, MA Hong-sheng2, ZHAI Shi-long3, WU Chuan-yong1   

  1. 1. Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011;
    2. Institute of Earthquake Science, CEA, Beijing 100036;
    3. Management Bureau of Kezir Reservoir, Baicheng 842300, Xingjiang, China
  • Received:2007-07-27 Revised:2007-10-16 Online:2008-01-31 Published:2021-10-29

摘要: 用双差地震定位法对2005年9月23日克孜尔震群进行重新定位。 从平面上, 重新定位地震集中分布在一个长约14.5 km, 宽约 9.0 km的长方形内, 其长轴为N30°W向, 与克孜尔断裂近乎垂直。 从震源深度来看, 重新定位地震的震源深度全部分布在21 km以内, 集中分布在10~19 km, 平均深度为13.6 km; 震群中绝大部分小震发生在沉积层内, 而震级较大地震基本发生在结晶地壳的上地壳内。 其剖面图显示, 这次震群是从结晶地壳开始沿着N30°W方向向上破裂至沉积层。 根据震区附近断裂性质和该区历史小震震中分布分析认为, 克孜尔水库库区附近可能存在两条共轭断裂, 右翼断裂可能是这次震群的发震构造。

关键词: 双差地震定位法, 震中, 震源深度, 克孜尔震群

Abstract: The Kezir earthquake swarm occurred on Sep. 23, 2005 was relocated with the double different earthquake location algorithm. The result shows that distribution of the earthquake and aftershocks is in a rectangle with long margin of 14.5 km and width margin of 9.0 km, and the direction of long axis is N30°W, it nearly parallel to the Kezir fault. The depth is distributed within 21 km, and the most are concentrated between 10~19 km, the average depth is 13.6 km; most of the small earthquakes occurred in the sedimentary cover, but the majority of earthquakes with bigger magnitude occurred in the upper crystalline crust. The earthquake swarm ruptures from crystalline crust to sedimentary cover along the N30°W direction. According to the characteristics of faults near the epicenter region and the distribution of historical earthquakes, two conjugate faults maybe exist in the Kezir reservoir region, and the right fault may be the causative fault of earthquake swarm.

Key words: The Double Different Earthquake Location Algorithm, Epicenter, Focal Depth, Kezir Earthquake Swarm

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