Earth, Planets and Space

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

Site	Tokachi-Oki Eq. (2003)			Kushiro-Oki Eq. (2004)			Eastern Iburi Eq. (2018)
Site	OCC (cm)	ECC (cm)	OCC/ECC	OCC (cm)	ECC (cm)	OCC/ECC	OCC (cm)	ECC (cm)	OCC/ECC
ABT	− 59	− 12.6	4.6	− 35	− 0.1	350	n.d.	− 0.4	n.d.
JNS	− 22	− 9.9	2.2	n.d.	n.d.	n.d.	− 3.5	− 0.8	4.4
KTB	− 5	− 6.7	0.7	0	0.1	0.0	− 3.0	− 0.6	5.0
TKC	n.d.	n.d.	n.d.	n.d.	n.d.	n.d.	n.d.	− 0.2	n.d.
TSK	n.d.	n.d.	n.d.	n.d.	n.d.	n.d.	n.d.	− 0.1	n.d.
YCG	10	− 31.5	− 0.3	0	0.1	0.0	− 3.3	− 3.8	0.9

Observed coseismic change (OCC) of groundwater level and expected coseismic change (ECC) in groundwater level from the M₂ tidal component
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)

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