Abstract We scan the coseismic response of Three Gorges well network to the global earthquakes of magnitude 7 and above during 2013 to 2022, evaluate the reflecting ability of each well in Three Gorges well network, analyze the influencing factors of the reflecting ability, and discuss the conditions for generating step type coseismic response. We take the 2008 Wenchuan 8.0 and the 2021 Maduo 7.4 earthquakes as examples, and use the coseismic response of well water level to inverse the stress adjustment in Three Gorges reservoir area. The results show that there is a positive correlation between seismic energy density and coseismic response amplitude; the threshold values of seismic energy density that can cause the water level of each well to produce coseismic response have an order of magnitude difference, which reflects the different earthquake reflecting capacities of each well; the seismic reflection capacity of the wells in Three Gorges well network are positively correlated with the hydraulic conductivity, and negatively correlated with the bulk compression modulus and the distance from the well to the fault; when the seismic energy density is greater than 10-3 J/m3 and the regional tectonic stress accumulation is strong, the coseismic response of the well water level in Three Gorges well pattern is mainly stepped. Through inversion of the stress changes in Three Gorges well network after the Wenchuan 8.0 and Maduo 7.4 earthquakes, we find that the stress adjustment is obviously controlled by regional faults.
TU Xianxin,Lü Pinji,AN Yifan et al. Response Characteristics of Three Gorges Well Network to Strong Earthquakes above M7.0[J]. jgg, 2023, 43(8): 875-880.
TU Xianxin,Lü Pinji,AN Yifan et al. Response Characteristics of Three Gorges Well Network to Strong Earthquakes above M7.0[J]. jgg, 2023, 43(8): 875-880.