基于机器学习的阿鲁科尔沁旗M_(S)4.7地震发震构造研究  

A Study on the Seismogenic Structure of M_(S)4.7 Earthquakein Ar Horqin Banner Based on Machine Learning

作　　者：裴东洋 张帆[1] 李娟[1] 王禄军 王磊[1] 崔丰智 白少奇 PEI Dongyang;ZHANG Fan;LI Juan;WANG Lujun;WANG Lei;CUI Fengzhi;BAI Shaoqi(Earthquake Agency of Inner Mongolia Autonomous Region,Hohhot 010010,China)

机构地区：[1]内蒙古自治区地震局,呼和浩特市010010

出　　处：《大地测量与地球动力学》2025年第5期470-476,共7页Journal of Geodesy and Geodynamics

基　　金：内蒙古自治区地震局局长基金(2023MS05);中国地震局震情跟踪定向工作任务(2024010104,2022010128)。

摘　　要：基于2021-10-15阿鲁科尔沁旗M_(S)4.7地震震后3个月的连续波形资料,利用机器学习方法进行震相到时拾取和震相关联。初步构建的机器学习地震目录中包含386个地震事件,是同时段内蒙古台网人工目录地震事件数量的17倍。然后利用事件波形中P/S波震相到时信息,采用双差定位方法对上述余震事件进行精定位,研究该次地震发震构造。结果表明,阿鲁科尔沁旗M_(S)4.7地震的余震事件有近NW向和近NEE向2个主要的展布方向,分布在主震周围1~5 km范围内。根据重定位结果并结合地貌上的线性构造推测,此处存在未探明的隐伏断层,本次4.7级地震及其余震的分布主要受近NW向隐伏断层和近NEE向构造控制。Based on continuous waveform data from the M_(S)4.7 earthquake in Ar Horqin Banner on October 15,2021,for three months post-earthquake,machine learning methods were utilized for picking earthquake phases and associating them.The preliminary machine learning-based earthquake catalog constructed includes 386 seismic events,which is 17 times the number of events in the manual catalog of the Inner Mongolia seismic network for the same period.Subsequently,using the P/S phase arrival time information from the event waveforms,a double-difference location method was applied to precisely locate the aforementioned aftershocks and study the seismogenic structure of the earthquake.The results indicate that the aftershocks of the M_(S)4.7 earthquake in Ar Horqin Banner have two main directions of distribution,nearly NW and nearly NEE,within a 1-5 km range around the mainshock.Based on the relocation results and combined with linear geological structures on the topography,it is suggested that there exists an unidentified hidden faults.The distribution of the 4.7 magnitude earthquake and its aftershocks is primarily controlled by the nearly NW-oriented hidden faults and the nearly NEE-oriented structures.

关 键 词：阿鲁科尔沁旗M_(S)4.7地震 机器学习 双差定位 发震构造 

分 类 号：P315[天文地球—地震学]