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

Figure 14

Phase shift to the O₁ (black dots)/M₂ (red dots) tide of water level in the Gaocun well calculated with a moving time window of (a) 27.95/29.5 days and (b) 15 days. The dashed lines indicate the occurrence time of the 2008 7.9 Wenchuan earthquake.

(a)

(b)