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[1]张 演,姜金钟,王光明,等.云南盐津地区两种地震序列的地震活动性分析[J].地震研究,2024,47(02):178-190.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0023]
　ZHANG Yan,JIANG Jinzhong,WANG Guangming,et al.Analysis of the Seismicity of Two Types of Earthquake Sequences in Yanjin,Yunnan[J].Journal of Seismological Research,2024,47(02):178-190.[doi:10.20015/j.cnki.ISSN1000-0666.2024.0023]
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云南盐津地区两种地震序列的地震活动性分析(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
47
期数:
2024年02期
页码:
178-190
栏目:
出版日期:
2023-12-01

文章信息/Info

Title:
Analysis of the Seismicity of Two Types of Earthquake Sequences in Yanjin,Yunnan
作者:
张 演1; 2; 姜金钟1; 2; 王光明1; 2; 张 帅1; 2; 何德强3; 周青云1; 2
(1.云南省地震局,云南 昆明 650224; 2.中国地震局昆明地震预报研究所,云南 昆明 650224; 3.昭通市防震减灾局,云南 昭通 657000)
Author(s):
ZHANG Yan1; 2; JIANG Jinzhong1; 2; WANG Guangming1; 2; ZHANG Shuai1; 2; HE Deqiang3; ZHOU Qingyun1; 2
(1.Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)(2.Kunming Institute of Earthquake Prediction,China Earthquake Administration,Kunming 650224,Yunnan,China)(3.Zhaotong Earthquake Preparedness and Disaster Reduction Agency,Zhaotong 657000,Yunnan,China)
关键词:
盐津地区;  地震检测;  匹配定位方法;  双差重定位;  地震序列;  发震构造
Keywords:
the Delingha earthquake;  earthquake relocation;  focal mechanism;  seismic tectonic background;  Qinghai
分类号:
P315.72
DOI:
10.20015/j.cnki.ISSN1000-0666.2024.0023
摘要:
2020年9月—2021年1月,云南盐津地区出现了密集中小地震活动。为获取更完备的地震目录和更准确的震源参数,利用2020年1月—2021年2月云南及其邻区地震台网记录到地震事件的观测报告和连续波形,采用匹配定位方法检测到了1 340次地震事件。利用联合波形互相关的双差地震定位方法进行重定位,获得了检测目录中351次地震的精确位置,对精定位后的地震活动时空分布特征进行分析研究,结果表明:盐津地区发生的密集中小地震活动为先后发生的2种不同类型的地震序列,沿两条不同走向和倾角的断裂分布,其中2020年9—10月的ML3.9震群型地震序列发生在NNW走向、倾角约为75°的盐津—筠连断裂; 2021年1月的ML5.2孤立型地震序列发生在近SN走向、断层线与盐津—筠连断裂呈约30°夹角且倾角约为50°的隐伏断裂。
Abstract:
Based on the catalogue and waveforms of moderate- and small-earthquakes occurring in Yanjin area during September 2020 to January 2021,we use the Match and Locate(M&L)method to detect and locate weak events.A total of 1 340 events are detected by the M&L method,which are about 6.7 times the number of events listed in the Yunnan Seismic Networks Catalogue.We then obtain refined hypocenters of 351 detected earthquakes by simultaneously using P and S travel times and waveform cross-correlation data in the double-difference relocation algorithm.We also investigate the spatial-temporal characteristics of the detected earthquakes after double-difference relocation.Our results indicate that the moderate- and small-earthquakes occurring in Yanjin area during September 2020 to January 2021 could be categorized as two different types earthquake sequences:the ML3.9 swarm mainshock type,and the ML5.2 isolated earthquake.These two types of earthquake sequences occurred along two different faults with different strike and dip angles.The ML3.9 swam sequence occurred on the Yanjin-Junlian fault with a strike of NNW direction and dip angle of about 75°,and the ML5.2 isolated sequence occurred on a blind fault with a strike of near NS direction and a dip angle of about 50°.

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备注/Memo

备注/Memo:
收稿日期:2023-03-01.
基金项目:云南省地震局传帮带项目(CQ3-2021003); 中国地震局地震科技星火计划项目(XH212502Y); 云南省地震局“地震机理与孕震环境研究”创新团队.
第一作者简介:张 演(1988-),工程师,主要从事地震学工作.E-mail:2354680472@qq.com.
通信作者简介:姜金钟(1987-),副研究员,云南省地震局青年骨干人员培养导师,主要从事地震学工作.E-mail:jz_jiang@foxmail.com.
更新日期/Last Update: 2024-03-20