北京大学学报自然科学版 ›› 2018, Vol. 54 ›› Issue (4): 730-738.DOI: 10.13209/j.0479-8023.2017.099

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基于模板识别方法探测断层结构

吴梦羽1, 毛淑娟2, 宁杰远1,†, 唐启家3, 蒋一然1   

  1. 1. 北京大学地球与空间科学学院, 北京 100871
    2. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge 02139
    3. 中国地质大学(武汉)地球物理与空间信息学院, 武汉 430074
  • 收稿日期:2017-05-04 修回日期:2017-05-24 出版日期:2018-07-20 发布日期:2018-07-20
  • 通讯作者: 宁杰远, E-mail: njy(at)pku.edu.cn
  • 基金资助:
    内蒙古自治区 2016 年度科技重大专项“重点地区地震预测预警技术研究开发与推广示范”和中国地震科学台阵探测项目(DQJB16A0307)资助

Fault Structure Detection by Matched Filter Technique

WU Mengyu1, MAO Shujuan2, NING Jieyuan1,†, TANG Qijia3, JIANG Yiran1   

  1. 1. School of Earth and Space Sciences, Peking University, Beijing 100871
    2. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge 02139
    3. Institute of Geophysics and Geomaties, China University of Geoscience, Wuhan 430074
  • Received:2017-05-04 Revised:2017-05-24 Online:2018-07-20 Published:2018-07-20
  • Contact: NING Jieyuan, E-mail: njy(at)pku.edu.cn

摘要:

在模板识别和地震相对定位方法的基础上, 提出一种探测断层结构的地震学方法。借用为了发现更多相似地震而在模板识别方法基础上提出的弱模板识别方法, 探测与模板地震有空间位置差异的地震, 然后根据波形互相关得到的到时差确定新识别出的地震相对于模板地震的空间分布。由于该方法对相似度要求较低, 且因计算量小而可以扫描更长时间的地震记录, 所以可以探测到更多能够比较精准地刻画断层细结构的微地震。利用渤海湾地区40天的地震波数据, 初步证明了这一方法的可行性。

关键词: 模板识别方法(MFT), 断层结构, 地震定位, 渤海湾, 微地震

Abstract:

Based on matched filter technique (MFT) and earthquake relative location technique, a new method is proposed to detect fault structure. The weak matched filter technique (WMFT) is modified from MFT to find more similar earthquakes, which is now used to detected events different from known templates in location. After new events are detected, their locations relative to templates can be given by using time differences from cross correlation. Due to low requirement of the WMFT in wave similarity and its low computational cost, more events can be detected and might help depict the structure of faults clearly. The feasibility of this method is primarily proved by the study of Bohai Bay area using records of 40 days.

Key words: matched filter technique (MFT), fault structure, earthquake location, Bohai Bay, micro seismicity

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