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现代地质 ›› 2011, Vol. 25 ›› Issue (1): 114-121.

• 地球物理与工程地质 • 上一篇    下一篇

发震断层对微、宏观震中偏离的影响分析:以新疆地区为例

兰晓雯1,2,田家勇1,谢周敏1,姜文亮1,陆鸣1,时振梁 3   

  1. 1.中国地震局 地壳应力研究所,北京100085;2.中国地质大学 地球物理与信息技术学院,北京100083;
    3.中国地震局 地球物理研究所,北京100081
  • 出版日期:2011-02-24 发布日期:2011-02-27
  • 作者简介:兰晓雯,女,博士研究生,助理研究员,1978年出生,地球探测与信息技术专业,主要从事地震勘探、地震应急救援方面的研究工作。Email:lan_xiaowen@sina.com
  • 基金资助:

    地震行业科研专项项目(200708047);中国地震局地壳应力研究所基本科研业务专项资金资助项目(ZDJ2007-2; ZDJ2010-2) 。

Analysis on the Impact of Seismogenic Fault on the Micro and Macro-epicenter Deviation: Taking Xinjiang Area as an Example

 LAN  Xiao-Wen1,2, TIAN  Jia-Yong1, XIE  Zhou-Min1, JIANG  Wen-Liang1, LU  Ming1, SHI  Zhen-Liang 3   

  1. 1.Institute of Crustal Dynamics, China Earthquake Administration,Beijing100085,China;
    2.School of Geophysics and Information Technology, China University of Geosciences, Beijing100083,China;
    3.Institute of Geophysics, China Earthquake Administration,Beijing100081,China
  • Online:2011-02-24 Published:2011-02-27

摘要:

大量震例表明通常情况下地震的微、宏观震中有很大的偏离,如何在震后快速正确估计微、宏观震中偏离的程度,是目前迫切需要解决的重要问题。以新疆地区为例,详细研究了新疆地区Ms≥65级的历史地震微、宏观震中偏离与发震构造的空间分布关系。新疆地区主要的发震断层类型包括逆断层、逆冲走滑断层及走滑断层3种。针对不同的发震断层类型初步提出了根据发震构造快速估计6.5级以上强震微、宏观震中偏离的模型和方法。微、宏观震中偏离的理想方向取决于破裂的性质(如单侧破裂、双侧破裂),很难确定理想宏观震中在发震断层的确切位置,具有一定的随机性,但是地震微、宏观震中的偏离方向与新疆整体构造应力方向具有一致性,宏观震中位置一般位于发震断层上或其附近,在实际应用过程中可以认为宏观震中就在断层上。

关键词: 快速估计, 宏观震中, 微观震中, 偏离, 断层, 发震构造, 新疆地区

Abstract:

How to estimate the micro and macro-epicenter deviation is a key problem to earthquake emergency and rescue response. Taking Xinjiang area as an example, this study investigated the relationship between micro and macro-epicenter deviation and seismogenics structures, and provided a new method for the fast determination of possible macro-epicenter based on the micro-epicenter and seismogenics structures for the earthquakes Ms≥6.5. There are 3 types of faults in Xinjiang, including the thrust fault, the thrust-slip fault and the strike-slip fault. The deviation of the ideal micro-epicenter direction depends on the nature of rupture (such as unilateral rupture, bilateral rupture), so it is difficult to determine the exact location of the ideal micro-epicenter in the seismogenic fault, and it is a certain randomness, but the deviation of the micro  and macro-epicenter is consistent with the overall direction of tectonic stress direction. The macro-epicenter location is located in or near the seismogenic fault in actual application.

Key words:  fast determination, macro-epicenter, micro-epicenter, deviation, fault, seismogenics structure, Xinjiang area

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