标题：Research on Shallow Stress Variation before and after the 2011 Japan Earthquake in Bohai Strait and Its Adjacent Area
作者：Zheng, Hongxia; Ding, Renwei; Zhao, Jian; Zhang, Xunhua; Zhao, Tiehu
通讯作者：Zheng, HX;Zheng, HX
作者机构：[Zheng, Hongxia; Zhao, Jian] China Univ Petr East China, Sch Geosci, Qingdao 266580, Shandong, Peoples R China.; [Zheng, Hongxia; Zhang, Xunhua; Zha 更多
会议名称：4th International Conference on Advances in Energy Resources and Environment Engineering (ICAESEE)
会议日期：DEC 07-09, 2018
来源：4TH INTERNATIONAL CONFERENCE ON ADVANCES IN ENERGY RESOURCES AND ENVIRONMENT ENGINEERING
摘要：To identify the geostress adjustment process of Japanese earthquake in Bohai Strait and its surrounding area, based on the data of 10 shallow hydraulic fracturing drills in the axis of the channel acquired from 2012 to 2014, the dispersed point charts and regression formulas of each parameter with depth were established and calculated. The results showed that between 2010 and 2014, the horizontal differential stress first decreased and then increased, and the direction of stress first rotated clockwise and then counter-clockwise. Therefore, coseismic and postseismic displacement triggered by Japanese earthquake caused shallow extensional effect which lasted from 2011 to 2012 in research area, and shallow stress didn't return to the original level until 2013. During the period of shallow stress reduction, the fault zone of seismic hazard was reduced as the compressive strain energy was released, while during the period of sustained stability after stress recovery the NWW fault zone had the maximum seismic hazard than NNE. The results were of great significance for research on shallow stress accumulation caused by earthquake, fault activity and the construction of tunnel in Bohai Strait and its surrounding area.