Study on the Coseismic Response of Seismic Underground Fluid in Xiadian Fault Zone [夏垫断裂带地震地下流体的同震响应研究]

作者：Xue H.-P.; Zhang L.; Lu L.-N.^*; Li J.; Wei Q.; Liu Q.

来源：Earthquake, 2020, 40(1): 184-202.

DOI：10.12196/j.issn.1000-3274.2020.01.015

• Coseismic response
• Groundwater level
• Groundwater temperature
• The Xiadian fault zone

Subsurface fluids observation has already become an important mean for monitoring earthquake. Therefore, this paper assembled and summarized typical coseismic response data of underground water level and temperature collected from wells on the Xiadian fault, for analyzing underground fluids coseismic response characteristics and impact. This work studies response characteristics of fluid data such as responsive seismic frequency, anomaly range, time, types of behaviors, and gives some discussions on epicentral distance, earthquake magnitude and well-aquifer lithology for anomaly genesis. The analysis results show that the response capacity of groundwater level data is more prominent then that of water temperature collected from well Zhaogezhuang and Xiji, and that response behaviors give priority to the oscillation type which has striking response to ≥MS7.0 earthquake, moreover, indicate that water temperature data only respond to Wenchuan MS8.0 earthquake which are collected from well Zhaogezhuang with response amplitude 0.0129℃. Comprehensive analysis suggests that well-aquifer lithology affects coseismic responsive behaviors and characteristics of the two wells, and that the dynamic strain generated by large far-field earthquake result in large fluctuation of groundwater level.

• 单位
  中国科学院大学; 中国地震局