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Table 2 Theoretical amplitudes and phase shifts of the M2 tidal constituent used to estimated volumetric strain, equilibrium tide, oceanic tide loading effect, and total tidal strain, calculated using GOTIC2, and average responses in observed groundwater level, calculated using BAYTAP-G

From: Coseismic changes in groundwater level during the 2018 Hokkaido Eastern Iburi earthquake

 Equilibrium tideOceanic tideTotalAverage values of water level
Amp. (10−9)Phase (°)Amp. (10−9)Phase (°)Amp. (10−9)Phase (°)Amp. (mm)Phase (°)
ABT9.840.04.21− 99.510.05− 24.40.84 ± 0.14− 31.0 ± 9.8
JNS10.010.03.47− 99.210.06− 19.95.02 ± 0.08− 25.0 ± 1.0
KTB10.000.03.73− 99.710.07− 21.43.07 ± 0.14− 23.8 ± 2.6
TKC9.540.01.72− 91.59.65− 10.34.97 ± 0.12− 44.3 ± 1.4
TSK9.530.02.03− 94.59.59− 12.23.99 ± 0.07− 11.5 ± 1.0
YCG10.090.02.48− 97.210.08− 14.126.88 ± 0.19− 117.0 ± 0.4
  1. Negative phase shifts correspond to lags behind the equilibrium tide