|本期目录/Table of Contents|

[1]王光明,彭关灵,赵小艳,等.基于地震序列时空分布特征分析维西—乔后断裂带地震危险性[J].地震研究,2021,44(03):367-379.
　WANG Guangming,PENG Guanling,ZHAO Xiaoyan,et al.Seismic Risk of the Weixi-Qiaohou Fault Zone Based on Temporal-spatial Distribution Characteristics of Earthquake Sequences[J].Journal of Seismological Research,2021,44(03):367-379.
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基于地震序列时空分布特征分析维西—乔后断裂带地震危险性(PDF/HTML)

《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:
44
期数:
2021年03期
页码:
367-379
栏目:
出版日期:
2021-10-20

文章信息/Info

Title:
Seismic Risk of the Weixi-Qiaohou Fault Zone Based on Temporal-spatial Distribution Characteristics of Earthquake Sequences
作者:
王光明; 彭关灵; 赵小艳; 付 虹
(云南省地震局,云南 昆明 650224)
Author(s):
WANG Guangming; PENG Guanling; ZHAO Xiaoyan; FU Hong
(Yunnan Earthquake Agency,Kunming 650224,Yunnan,China)
关键词:
维西—乔后断裂;  漾濞MS6.4地震;  地震重定位;  余震衰减;  地震危险性
Keywords:
the Weixi-Qiaohou fault zone;  the Yangbi MS6.4 earthquake;  earthquake relocation;  attenuation of the aftershock sequence;  earthquake hazard
分类号:
P315.2
DOI:
-
摘要:
2013年以来,维西—乔后断裂带进入中强地震活跃期,2021年5月21日漾濞MS6.4地震发生前,已有3组MS≥5.0地震连续发生,表明该断裂带地震活动显著增强。采用双差定位方法对2013年以来发生在维西—乔后断裂带周边的4组地震序列进行重定位,并使用ZMAP软件包计算序列的b值和p值。结果显示,维西—乔后断裂带周边地震序列呈现出两组明显不同的时空分布特征,余震序列优势分布方向为NW向的3组地震序列衰减较快,序列b值相对较低,序列震中分布长宽比较大; 2016年云龙MS5.0地震序列优势分布方向为NE向,序列震中分布长宽比较小,衰减较慢,序列b值相对较高。基于序列类比结果和b值时间变化曲线分析认为,2021年漾濞MS6.4地震序列后续发生较大破坏性余震的可能性较小。综合2013年以来维西—乔后断裂带中强地震时空分布特征和区域地质构造资料分析认为,未来该地区MS≥5.0地震存在向东南或向北迁移的可能性。
Abstract:
Before the Yangbi MS6.4 earthquake on May 21,2021,three groups of MS≥5.0 earthquakes have occurred continuously,indicating that the seismic activity of the Weixi-Qiaohou fault zone has increased significantly since 2013.In this paper,we employ double-difference relocation algorithm to relocate earthquake sequences around the Weixi-Qiaohou fault zone since 2013,and use ZMAP to calculate the b-value and p-value of these sequences.The earthquake sequences around the Weixi-Qiaohou fault zone present obviously two different types of temporal-spatial distribution characteristics.Three earthquake sequences concentrate in a NW-trend band,which is parallel with the Weixi-Qiaohou fault,and the length-width ratios of the epicenter distribution of these earthquake sequences are larger.Furthermore,these three earthquake sequences decay faster and their b-values are relatively lower,while the Yunlong MS5.0 earthquake sequence in 2016 concentrates to a NE-trend band,and the length-width ratio of the epicenter distribution is relatively smaller.Also,the Yunlong MS5.0 earthquake sequence decays slower than the other three earthquake sequences,and its b-value is relatively higher.A contrastive analysis of earthquake sequences around the Weixi-Qiaohou fault zone shows that the possibility of large destructive aftershocks following the 2021 Yangbi MS6.4 earthquake sequence is small.Based on a comprehensive analysis of the spatial-temporal distribution characteristics of the moderately-strong earthquakes in the Weixi Qiaohou fault zone since 2013 and regional geological structure study,it is considered that MS≥5.0 earthquakes in this area may migrate to the Southeast(or the North)in the future.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期:2021-07-19
基金项目:云南省地震局自立科研项目——漾濞地震专项(2021YBZX03)、地震科技星火计划项目(XH20054Y)、国家自然科学基金——云南联合基金重点项目(U2002211)及云南省地震局“地震机理与孕震环境研究”创新团队联合资助.

更新日期/Last Update: 2021-10-20