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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 tide

Oceanic tide

Total

Average values of water level

Amp. (10−9)

Phase (°)

Amp. (10−9)

Phase (°)

Amp. (10−9)

Phase (°)

Amp. (mm)

Phase (°)

ABT

9.84

0.0

4.21

− 99.5

10.05

− 24.4

0.84 ± 0.14

− 31.0 ± 9.8

JNS

10.01

0.0

3.47

− 99.2

10.06

− 19.9

5.02 ± 0.08

− 25.0 ± 1.0

KTB

10.00

0.0

3.73

− 99.7

10.07

− 21.4

3.07 ± 0.14

− 23.8 ± 2.6

TKC

9.54

0.0

1.72

− 91.5

9.65

− 10.3

4.97 ± 0.12

− 44.3 ± 1.4

TSK

9.53

0.0

2.03

− 94.5

9.59

− 12.2

3.99 ± 0.07

− 11.5 ± 1.0

YCG

10.09

0.0

2.48

− 97.2

10.08

− 14.1

26.88 ± 0.19

− 117.0 ± 0.4

  1. Negative phase shifts correspond to lags behind the equilibrium tide