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A Research on the 2014 Wenzhou M4.2 Earthquake in the Shanxi Reservoir
Zou Zhenxuan,Ma Zhijiang,Zhou Xinmin,Zhang Fan,Li Jun,Li Jinlong
Author NameAffiliation
Zou Zhenxuan Earthquake Administration of Zhejiang Province, Hangzhou 310013, China 
Ma Zhijiang Earthquake Administration of Zhejiang Province, Hangzhou 310013, China 
Zhou Xinmin Earthquake Administration of Zhejiang Province, Hangzhou 310013, China 
Zhang Fan Earthquake Administration of Zhejiang Province, Hangzhou 310013, China 
Li Jun Earthquake Administration of Zhejiang Province, Hangzhou 310013, China 
Li Jinlong Earthquake Administration of Zhejiang Province, Hangzhou 310013, China 
摘要:
Complete records of more than 3,000 earthquake events in the Shanxi, Wenzhou reservoir earthquake sequence were recorded from August to November, 2014 by the high-density, high-resolution monitoring stations of the Zhejiang Regional Digital Seismic Network and the reservoir earthquake monitoring network, with a maximum magnitude of M4.2. Based on 3-D epicenter location, focal mechanism solutions, and in combination with the geological and tectonic characteristics of the reservoir area, the earthquake sequence is discussed in this paper. The linear fitting of the HypoSAT location results show that the main shock occurred in the NW trending fault and the earthquake sequence is concentrated in bands along the active faults, with a strike of 305°, dipping SW with dip angle of 85°. By using P-wave first motion symbols, we obtained the average focal mechanism of M ≥ 3.5 earthquakes, with a strike 308° and dip 84° for nodal plane Ⅱ. The field geological survey and research show that the strike, dip and rake of nodal plane Ⅱ are roughly consistent with the occurrence of the Shuangxi-Jiaoxi fault. The comprehensive analysis reveals that the NW-trending Shuangxi-Jiaoxi fault is the seismogenic structure of the earthquakes.
关键词:  Reservoir earthquake  Monitoring network  The fault structure  The focal mechanism solution
DOI:
分类号:
基金项目:This research was jointly supported by the Science and Technology Project of Zhejiang Province (2012C33079) and the Youth Backbone Training Project of the Zhejiang Digital Seismic Natwork(20130207).
A Research on the 2014 Wenzhou M4.2 Earthquake in the Shanxi Reservoir
Zou Zhenxuan,Ma Zhijiang,Zhou Xinmin,Zhang Fan,Li Jun,Li Jinlong
Abstract:
Complete records of more than 3,000 earthquake events in the Shanxi, Wenzhou reservoir earthquake sequence were recorded from August to November, 2014 by the high-density, high-resolution monitoring stations of the Zhejiang Regional Digital Seismic Network and the reservoir earthquake monitoring network, with a maximum magnitude of M4.2. Based on 3-D epicenter location, focal mechanism solutions, and in combination with the geological and tectonic characteristics of the reservoir area, the earthquake sequence is discussed in this paper. The linear fitting of the HypoSAT location results show that the main shock occurred in the NW trending fault and the earthquake sequence is concentrated in bands along the active faults, with a strike of 305°, dipping SW with dip angle of 85°. By using P-wave first motion symbols, we obtained the average focal mechanism of M ≥ 3.5 earthquakes, with a strike 308° and dip 84° for nodal plane Ⅱ. The field geological survey and research show that the strike, dip and rake of nodal plane Ⅱ are roughly consistent with the occurrence of the Shuangxi-Jiaoxi fault. The comprehensive analysis reveals that the NW-trending Shuangxi-Jiaoxi fault is the seismogenic structure of the earthquakes.
Key words:  Reservoir earthquake  Monitoring network  The fault structure  The focal mechanism solution