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[1]王光明,刘自凤,赵小艳,等.2018年云南通海MS5.0地震序列重定位及发震构造讨论*[J].地震研究,2018,41(04):503-510.
 WANG Guangming,LIU Zifeng,ZHAO Xiaoyan,et al.Relocation of Tonghai MS5.0 Earthquake Sequence in 2018 and Discussion of it's Seismogenic Fault[J].Journal of Seismological Research,2018,41(04):503-510.
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2018年云南通海MS5.0地震序列重定位及发震构造讨论*(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
41
期数:
2018年04期
页码:
503-510
栏目:
出版日期:
2018-10-20

文章信息/Info

Title:
Relocation of Tonghai MS5.0 Earthquake Sequence in 2018 and Discussion of it's Seismogenic Fault
作者:
王光明刘自凤赵小艳樊文杰李永莉彭关灵孙 楠
(云南省地震局,云南 昆明 650224)
Author(s):
WANG GuangmingLIU ZifengZHAO XiaoyanFAN WenjieLI YongliPENG GuanlingSUN Nan
(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)
关键词:
通海地震 双差定位 发震构造 明星—二街断裂
Keywords:
Tonghai MS5.0 earthquake double-difference location algorithm seismogenic fault Mingxing-Erjie Fault
分类号:
P315.53
DOI:
-
摘要:
利用云南数字地震台网的快报观测报告和地震事件波形数据,采用双差定位方法对2018年云南通海MS5.0地震序列进行重定位,使用Seis_CAP程序和改进的格点尝试法同时反演2次主震的震源机制解。重定位后,2次通海主震的震中位置分别为(24.188°N,102.726°E)和(24.191°N,102.725°E),震源深度分别为11.08 km和9.24 km。重定位结果显示,通海地震序列震中位置呈NE-SW向条带状分布,震源深度优势分布范围为3~12 km。震源机制解反演结果表明,2次主震均为走滑型地震,最佳拟合深度分别为8.1 km和6.4 km。综合分析重定位后地震序列空间分布、主震震源机制解和地质资料,认为小江断裂带中南段西支的明星—二街断裂或与其平行的隐伏断裂可能是此次地震的发震断裂。
Abstract:
Using catalog data and seismic waveform data recorded by the Yunnan Digital Seismic Network,we relocated Tonghai MS5.0 earthquake sequence with double-difference location algorithm.In the meantime,we inversed focal mechanism of the mainshocks with Seis_CAP program and improved grid point test method.After relocation,the epicentral location of Tonghai MS5.0 earthquake sequence exhibited in a narrow band along the NE-SW direction,and the predominant range of depth distribution was 3~12 km.The distance between two mainshocks was shorter after relocation,and the focal depth of two mainshocks were 11.08 km and 9.24 km respectively.The inversion results of focal mechanism show that the types of two MS5.0 mainshocks were both strike-slip earthquakes and the best fitting focal depts of them are 8.1 km and 6.4 km respectively.Based on the comprehensive analysis of the spatial distribution of Tonghai earthquake sequence after relocation,focal mechanism solutions and the geological data,we deduced that the seismogenic fault of Tonghai earthquake sequence may be the Mingxing-Erjie Fault or a hidden fault which was parallel to it in the western branch of the Xiaojiang Fault.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2018-08-24
基金项目:2018年中国地震局监测预报司地震大形势项目《南北地震带及新疆地震精确定位》、云南省地震局科技人员传帮带项目(C3-201706)和云南地区地震精确定位(036022004050316)共同资助.
通讯作者:刘自凤(1986-),助理研究员,主要从事地震活动性、数字地震学方面的研究.E-mail:annefine@126.com

更新日期/Last Update: 2018-10-30