YNAO OpenIR  > 系外行星研究组
2015年5月云南双柏M_L4.1地震活动机理初探
Alternative TitleA Preliminary Study of Mechanism for the 2015 Shuangbai ML4.1 Earthquake
李涛1; 付虹1; 徐甫坤2
Source Publication中国地震(Earthquake Research in China)
2018-06
Volume34Issue:02Pages:337-349
ClassificationP315
Contribution Rank第2完成单位
Indexed By核心
Keyword双柏地震 双差定位法 震源机制解 发震机理
Abstract

2015年5月19日9时58分,云南双柏、峨山一带出现密集的小震活动,并于6月14日发生ML4.1地震,形成显著的震群事件。本文利用双差定位法对该震群进行精定位,结果显示,重新定位后震中分布优势方向更明显,主要沿绿汁江南段断裂呈NNE向分布,震源深度为6~12km,其中,又以8~10km最具优势。与原始数据相比,重定位后残差明显减小,走时残差平方和由原来的0.303s降为0.034s,震源位置估算误差在EW方向平均为0.21km,在NS方向平均为0.173km,在垂直方向平均为0.175km;利用广义极性振幅技术(GPAT)方法,计算得到了24个ML≥2.5地震的震源机制解,结果显示,此次震群的震源机制类型绝大部分表现为正断性质,与该区历史地震多为走滑的结果有所差异。结合震区附近的龙门水库蓄水水位和该震群的频度-震级关系分析认为,双柏震群活动与水库蓄水过程密切相关,该震群的发生是龙门水库水体载荷加载而引起正断层产生错动的结果。

Other Abstract

A notable earthquake swarm occurred near the Shuangbai and Eshan area and its activities continue since 09:58, May 19, 2015. The largest magnitude is ML4. 1 which occurred on June 14. We relocated this swarm by using hypoDD method. It has been shown that: the earthquake
swarm distributed along the Lvzhijiang fault,and the dominant direction of relocated aftershocks is more obvious than before.  The focal depths are at 6~12km,and 8~10km underground is the dominate layer where earthquakes can occur more easily. In comparison with original data, the RMS average value of arrival residual decreases form 0.303s to 0.034s,and the average error is 0.21km in EW direction,0.13km in NS direction and 0.175km in vertical direction. We calculated the focal mechanisms for earthquakes with magnitudes larger than ML2.5 by using an inversion technique for focal mechanisms of local and regional earthquake, named Generalized Polarity and Amplitude Technique(GPAT), and 24 results were obtained in the end. The results show that the main type of focal mechanisms for this swarm is normal, and this is not the same as before. On the basis of the water level of the Longmen reservoir dam and the frequency and magnitude of the earthquakes,we suggest that the activities of this swarm are closely related with the process of reservoir inpounding. This swarm is the result of a normal fault movement which was caused by the reservoir inpounding.

Funding Project云南省地震局传帮带项目[C2-2014003]
Funding Organization云南省地震局传帮带项目[C2-2014003]
Language中文
Subject Area地球科学 ; 固体地球物理学 ; 地震学
MOST Discipline Catalogue理学 ; 理学::地球物理学
ISSN1001-4683
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/12369
Collection系外行星研究组
Affiliation1.云南省地震局,昆明市北辰大道148号,650224
2.云南天文台,昆明,650216
Recommended Citation
GB/T 7714
李涛,付虹,徐甫坤. 2015年5月云南双柏M_L4.1地震活动机理初探[J]. 中国地震(Earthquake Research in China),2018,34(02):337-349.
APA 李涛,付虹,&徐甫坤.(2018).2015年5月云南双柏M_L4.1地震活动机理初探.中国地震(Earthquake Research in China),34(02),337-349.
MLA 李涛,et al."2015年5月云南双柏M_L4.1地震活动机理初探".中国地震(Earthquake Research in China) 34.02(2018):337-349.
Files in This Item:
File Name/Size DocType Version Access License
2015年5月云南双柏M_L4_1地震活(4546KB)期刊论文出版稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[李涛]'s Articles
[付虹]'s Articles
[徐甫坤]'s Articles
Baidu academic
Similar articles in Baidu academic
[李涛]'s Articles
[付虹]'s Articles
[徐甫坤]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[李涛]'s Articles
[付虹]'s Articles
[徐甫坤]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2015年5月云南双柏M_L4_1地震活动机理初探_李涛_付虹_徐甫坤.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.