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地震 ›› 2004, Vol. 24 ›› Issue (4): 51-56.

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用PTD方法测定巴林左旗5.9级地震震源深度

王新岭1, 张国民1, 马宏生1, 王辉1, 汪素云2   

  1. 1.中国地震局分析预报中心, 北京 100036;
    2.中国地震局地球物理研究所, 北京 100081
  • 出版日期:2004-10-31 发布日期:2021-11-29
  • 作者简介:王新岭(1979-), 男, 河南睢县人, 2002年在读硕士研究生, 主要从事大陆震源深度分布与孕震机理等研究。
  • 基金资助:
    国家重点基础研究发展规划项目(G19980407)

Locating the focal depth of Balinzuoqi MS5.9 earthquake using the PTD earthquake location algorithm

WANG Xin-ling1, ZHANG Guo-min1, MA Hong-sheng1, WANG Hui1, WANG Su-yun2   

  1. 1. Center for Analysis and Prediction, CEA, Beijing 100036;
    2. Institute of Geophysics, CEA, Beijing 100081, China
  • Online:2004-10-31 Published:2021-11-29

摘要: 震源深度是描述震源的最基本参数之一, 给出了地震发生在地球内部的具体位置, 对了解地震孕育和发生的物理化学条件, 以及地震能量集结、 释放的活动构造背景都有重要的意义。 根据PTD方法, 对2003年8月16日发生的内蒙古自治区巴林左旗5.9级地震的震源深度进行了测定, 测定震源深度为20 km, 与东北地震构造区地震平均深度11±5 km相比偏深。 文中进一步分析讨论了对测定结果产生误差的各种因素, 给出了减小误差的应对措施; 在此基础上结合相关研究成果对地震区周围的地壳P波速度结构进行了探讨, 给出了具体的P波二层均匀速度结构。

关键词: 巴林左旗5.9级地震, PTD方法, 震源深度, 首波, 直达波

Abstract: Focal depth is one of the most basic seismological parameters, showing where the earthquake occurred in the earth, which will be of great significance to investigate the physical and chemical condition of seismic generation and occurrence, the tectonic background for concentration and release of seismic energy. In this paper the focal depth of the Balinzuiqi MS5.9 earthquake occurred on Aug. 16, 2003 was determined using the PTD earthquake location algorithm. The result is 20 km, which is deeper than the average focal depth (11±5) km in Northeast China block. Then this paper analyzes the result error, and gives solution. At last, it discusses the velocity structure of P wave of the crust in the earthquake region combined with correlative results, and two layers homogeneous velocity structure of P wave in the earthquake region is given.

Key words: Balinzuiqi MS5.9 earthquake, PTD earthquake location, Focal depth, Head wave, Direct wave

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