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地震 ›› 2016, Vol. 36 ›› Issue (2): 132-140.

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2012和2013年广东新丰江锡场2次MS4.8地震发震构造的确定*

邵叶, 刘特培, 刘吉平   

  1. 广东省地震局,广州 510070
  • 收稿日期:2015-07-14 修回日期:2015-12-17 出版日期:2016-04-30 发布日期:2020-07-06
  • 作者简介:邵叶(1987-),女,贵州遵义人,工程师,主要从事地震预测研究。
  • 基金资助:
    广东省科学基金项目(2006B372010)资助

Determination of the Seismogenic Structures of Two MS4.8Earthquakes in 2012and 2013in Xinfengjiang Xichang,Guangdong Province

SHAO Ye, LIU Te-pei, LIU Ji-ping   

  1. Earthquake Administration of Guangdong Province,Guangzhou 510070,China
  • Received:2015-07-14 Revised:2015-12-17 Online:2016-04-30 Published:2020-07-06

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摘要： 利用广东新丰江锡场2012和2013年2次MS4.8地震震中附近的2009年1月至2015年6月精定位小震资料,依据小震丛集发生在大震断层面及附近的原则,采用模拟退火算法和高斯-牛顿算法相结合的方法,反演得到了锡场附近2条相交断层的详细参数及地理分布。NEE向断层F1的走向为78.5°,倾角为87.7°,长度约8.2km,以右旋走滑错动为主;NW向断层F2的走向为137.3°,倾角为87.9°,长度约5.9km,以左旋走滑错动为主。用断层附近ML3以上地震的震源机制解证明反演结果是可靠的,并由2次4.8级地震的震源机制解判断出各自的发震断层。

关键词: 地震断层面, 震源机制解, 发震构造, 锡场地震

Abstract: It is well known that clustered small earthquakes often happen around the fault plane of large earthquakes.Based on simulated annealing algorithm and Gauss-Newton methods,using precisely located small earthquakes between January 2009and June 2015 which happened near the 2012and 2013 MS4.8earthquake epicenters in Xinfengjiang Xichang,we get detail parameters and geography of two intersecting faults.The length of NEE fault plane(F1)with right lateral strike slip is about 8.2km.Its strike is 78.5°and dip is 87.7°.The length of NW fault plane(F2)with left lateral strike slip is about 5.9km. Its strike is 137.3°and dip is 87.9°.The inversion results proved to be correct by the focal mechanisms of ML≥3earqaukes.At last,causative structures of the two MS4.8earthquakes are determined by their focal mechanisms.

Key words: Seismic fault, Focal mechanism, Inversion, Xichang earthquakes

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