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Table 4 Comparison of coseismic changes between the 2003 Tokachi-Oki, the 2004 Kushiro-Oki, and the 2018 Hokkaido Eastern Iburi earthquake

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

SiteTokachi-Oki Eq. (2003)Kushiro-Oki Eq. (2004)Eastern Iburi Eq. (2018)
OCC (cm)ECC (cm)OCC/ECCOCC (cm)ECC (cm)OCC/ECCOCC (cm)ECC (cm)OCC/ECC
ABT− 59− 12.64.6− 35− 0.1350n.d.− 0.4n.d.
JNS− 22− 9.92.2n.d.n.d.n.d.− 3.5− 0.84.4
KTB− 5− 6.70.700.10.0− 3.0− 0.65.0
TKCn.d.n.d.n.d.n.d.n.d.n.d.n.d.− 0.2n.d.
TSKn.d.n.d.n.d.n.d.n.d.n.d.n.d.− 0.1n.d.
YCG10− 31.5− 0.300.10.0− 3.3− 3.80.9
  1. Observed coseismic change (OCC) of groundwater level and expected coseismic change (ECC) in groundwater level from the M2 tidal component
  2. n.d. no data. The data of the Tokachi-Oki and Kushiro-Oki earthquakes are from Akita and Matsumoto (2004) and Shibata et al. (2010)