Research on Shallow Stress Variation before and after the 2011Japan Earthquake in Bohai Strait and Its Adjacent Area

4th International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Zheng, Hongxia^1^2 ; Ding, Renwei^3 ; Zhao, Jian^1 ; Zhang, Xunhua^2^4 ; Zhao, Tiehu^2^5

School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong

266580, China^1

Evaluation and Detection Technology Laboratory of Marine Mineral Resources, Qingdao, Shandong

266071, China^2

College of Earth Science and Engineering, ShanDong University of Science and Technology, Qingdao, Shandong

266590, China^3

China Geological Survey, Nanjing Center, Nanjing, Jiangsu

210016, China^4

China Geological Survey, Qingdao Institute of Marine Geology Qingdao, Shandong

266071, China^5

关键词: Compressive strain;    Counter-clockwise;    Differential stress;    Japan earthquakes;    Regression formulas;    Stress accumulation;    Stress reduction;    Stress variations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/237/3/032025/pdf
DOI  :  10.1088/1755-1315/237/3/032025

学科分类：环境科学（综合）

来源: IOP

【 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.