Fig. 6From: 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 EarthquakeRecord sections from shot L1 and M5. Phases recognized at far offsets (~ 80–200 km) are indicated by arrows. a Record section from shot L1. Interpretations for the phase “A” to “D” are shown in Fig. 7a or b. b Record section from shot M5. Interpretations for the phase “A” and “B” are shown in Fig. 8aBack to article page