黄清华,
北京大学地球与空间科学学院地球物理学系, 北京 100871
基金项目: 国家自然科学基金（41574104）资助
详细信息
作者简介: 刘书元, 男, 1995年生, 博士研究生, 研究方向为统计地震学.E-mail:liushuyuan@pku.edu.cn
通讯作者: 黄清华, 男, 教授, 1990年毕业于中国科学技术大学, 1999年获日本大阪大学博士学位, 主要从事地球电磁学、地震物理学方面的教学和科研工作.E-mail:huangq@pku.edu.cn
中图分类号: P315收稿日期:2020-05-26
修回日期:2020-08-05
上线日期:2020-11-05
Determining earthquake clustering regions by considering focal mechanisms
LIU ShuYuan,HUANG QingHua,
Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China
More Information
Corresponding author: HUANG QingHua,E-mail:huangq@pku.edu.cn
MSC: P315--> Received Date: 26 May 2020
Revised Date: 05 August 2020
Available Online: 05 November 2020
摘要
摘要:构造带区段的划分对地震区划与构造演化等研究有着重要作用，而地震丛集区可以为构造带区段的划分提供参考依据.本文发展了一种考虑震源机制解的地震丛集区搜索方法：基于震源机制解的四元数表示方法来定量评估不同地震的震源机制解的相似程度，并以满足给定相似度阈值条件的地震所占比例作为判据来确定地震丛集区.合成数据的测试结果显示，该方法能够对地震丛集区做有效搜索并区分具有不同震源机制特征的丛集区.将该方法应用于2011年日本M9.0东北大地震显示，搜索得到的地震丛集区与实际观测到的余震特征分布具有较好的一致性，表明该方法可以为实际的地震丛集区划分提供一条有效的途径.
关键词: 地震丛集区/
震源机制解/
区域搜索/
2011年日本东北地震/
构造区划分
Abstract:Zonation of tectonic belts plays an important role in the analyses of seismic zoning and tectonic evolution. Determination of earthquake clustering regions provides a basis for tectonic belt zonation. In this paper, we develop a new method to search for earthquake clustering regions by taking the focal mechanisms of earthquakes into consideration. We use the quaternion representation of focal mechanisms to quantify their similarity, and determine the earthquake clustering region based on the proportion of the events satisfying a given similarity threshold among all events in the region. Synthetic tests indicate that the method can effectively search for earthquake clustering regions and distinguish regions with dissimilar focal mechanisms. Application to the 2011 Tohoku earthquake yields clustering regions in good agreement with the observed characteristic distribution of aftershocks, demonstrating that the new method provides an effective means for the determination of earthquake clustering regions.
Key words:Earthquake clustering region/
Focal mechanism solution/
Regional search/
The 2011 Tohoku earthquake/
Tectonic belt zonation
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