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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)
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


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]
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
Document Type期刊论文
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.
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