Structural heterogeneity in and around the fold-and-thrust belt of the Hidaka Collision zone, Hokkaido, Japan and its relationship to the aftershock activity of the 2018 Hokkaido Eastern Iburi Earthquake

Earth, Planets and Space

Table 1 Seismic reflection experiments in the Hokkaido Transect Project

Profile	1998-W^a	1998-E^a	1999^b	2000^c
Source	Vibrator x 4 + explosive	Vibrator x 4 + explosive	Explosive	Vibrator x 4 + explosive
Shot interval (m)	200–300	200–300	~1000	200–300
Charge size of explosive (kg)	100	100	40–700	100–300
Number of shots	50 + 1	24 + 1	28	161 + 4
Receiver interval (m)	50/150	50	50	50/300
Number of receivers	312	200	1055	1073
Profile length (km)	15	10	58	70
Sampling interval (ms)	4	4	4/10	4/10
Record length(s)	20/40	20/40	30	16/20/60