摘要
本文利用深度学习算法PhaseNet、震相关联算法REAL以及多种定位算法快速地构建了2021年5月21日漾濞M_(S)6.4主震前3天至后7天的高分辨率地震目录,揭示了漾濞地震序列的精细位置分布及详细的时空迁移过程.漾濞地震序列的空间分布表现为多级雁列式结构,深度介于5~10 km之间.主断层自北西端朝着南东向呈放射状分布,并发育有多条贯穿主断层的共轭断层.早期前震随着时间有明显朝着主震迁移的特征,并呈现出一条狭长的条带状构造,反映其可能是地下流体运移的通道.
On 21 May 2021,a magnitude(M_(S))6.4 earthquake with significant foreshocks struck Yangbi,Yunnan.We utilized a deep-learning algorithm-PhaseNet,an earthquake association method-REAL and multiple earthquake location methods to rapidly build a ten-day high resolution earthquake catalog for the Yangbi earthquake sequence.The high-resolution catalog consists of 4574 events and reveals the detailed spatio-temporal migration and seismogenic structure of this sequence,which mainly show a multistage echelon structure radiating along SE direction with a depth range between 5 and 10 km.This catalog also outlines multiple orthogonal faults crossing the NE-trending main faults.The initial foreshocks migrate to M_(S)6.4 mainshock and form a narrow strip,which may represent the channel of fluid migration.
作者
苏金波
刘敏
张云鹏
王伟涛
李红谊
杨军
李孝宾
张淼
SU JinBo;LIU Min;ZHANG YunPeng;WANG WeiTao;LI HongYi;YANG Jun;LI XiaoBin;ZHANG Miao(Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;China University of Geosciences(Beijing),Beijing 100083,China;Urumqi Institute of Central Asian Seismology,China Earthquake Administration,Urumqi 830011,China;Dali Center,China Seismic Experimental Site,Dali Yunnan 671000,China;Dalhousie University,Halifax,B3H 4R2,Canada)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第8期2647-2656,共10页
Chinese Journal of Geophysics
基金
国家重点研发项目(2018YFC1503200)
国家自然基金(41874063)
地震科技星火计划课题(XH21041Y)
新疆地震科学基金(202003,202120)
上海佘山地球物理野外科学观测研究站(2020K02)
中国地震局地球物理研究所基本业务经费(DQJB21Z02)基金联合资助.
关键词
漾濞地震序列
高分辨率地震目录
深度学习
雁列式结构
流体运移
Yangbi Earthquake sequence
High-resolution earthquake catalog
Deep-learning
Echelon structure
Fluid migration
