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[1]LI Shuai,PAN Lili,YAN Xiaomin,et al.Research on Mechanism of Fluid Triggering 2013 Pingguo Earthquake Swarm in Guangxi[J].Journal of Seismological Research,2018,41(04):559-567.

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Research on Mechanism of Fluid Triggering 2013 Pingguo Earthquake Swarm in Guangxi

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 41 Number of periods: 2018 04 Page number: 559-567 Column: Public date: 2018-10-20

Title:: Research on Mechanism of Fluid Triggering 2013 Pingguo Earthquake Swarm in Guangxi

Author(s):: LI Shuai¹; PAN Lili²; YAN Xiaomin³; HUANG Hui⁴; LI Xiguang²; LI Zhiyong⁵; (1. School of Geoscience,Guilin University of Technology,Guilin 541004,Guangxi,China)(2. Earthquake Agency of the Guangxi Zhuang Autonomous Region,Nanning 530022,Guangxi,China)(3. Guangxi Mechanical and Electronic Industry School,Nanning 530023,Guangxi,Ch

Keywords:: fluid; Karst; Youjiang fault zone; Pingguo earthquake swarm; Guangxi

CLC:: P315.723

DOI:: -

Abstract:: In 2013,an earthquake swarm with shallow depth occurred in Guangxi Pingguo,and its triggering mechanism is still discussed. According to the survey on the permeability of structural fissures in the study area,we found that the faults or joints in NW and EW were the main paths for exchanging between the deep and the shallow fluids,and the shallow fluid infiltrated along the paths to forming the underground fluid zone. The 30 m high tailing pond retained water around sludge drainage before the earthquake changed the temperature and press of original underground fluid,which hastening the fluid flow to the secondary fault in NW of Youjiang fault zone and faults in EW. Combined with initial motions of seismic wave,μ-value test of the ETAS model and focal-mechanism solutions,we induced that the 2013 Pingguo earthquake swarm was caused by tectonic factor and the fluid participated in and triggered shallow faults. The earthquakes whose focal depth is above 3 km were caused by the high stress and stress concentration on the hanging wall of the Youjiang fracture zone. The other earthquakes whose focal depth is under 3 km triggered by following factors:①The osmosis of deep fluid changed the original stress system and reduced the available normal stress and effective strengthened of faults surface. Also it improved the press of deep fluid in the fault zone and hastened the local unlocking and slipping of shallow faults. ②The hydraulic contact,communication and exchanging between the shallow and deep fluids changed the temperature,press and stress environment.

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Last Update: 2018-10-30