Possible Continuous Vertical Water Leakage of Deep Aquifer: Records from a Deep Well in Tianjin Province, North China

Figure 1

Original water level of well Gaocun (from January 1st, 1981, to May 9th, 2020) with an obvious downward trend. The gaps indicate invalid original data records. The vertical dashed lines represent the start time of the 2008 7.9 Wenchuan earthquake and the 2011 9.1 Tohoku earthquake, which had not caused any influence on the water level. (GC is a nonartesian well; thus, the -coordinate axis indicates the distance from the water-level surface to the ground.)