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Fig. 8 | Earth, Planets and Space

Fig. 8

From: 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

Fig. 8

Record section with theoretical travel times and ray diagrams for shot M5. a Record section for shot M5 on which travel time curves from the velocity model (Fig. 5a) are shown. Travel times of first arrival are shown by a green line. Phases “A” and “B” recognized at far offsets (Fig. 6b) are interpreted to be Pn and PmP waves, respectively. PiP1 and PiP2 waves are reflections from interfaces of R1 and R2 (see b). These phases appear only in the eastern part of the profile, but not in the western part where phases “A” and “B” are noticed (see also Fig. 6b). b Ray diagram for PmP (light blue) and Pn (red) phases. A broken circle indicates the lower crustal part in the side of the Kuril Arc which are penetrated by rays from shot M5. Travel time variation by the change of velocity values in this region was calculated to check our Moho depth estimation (see the text for detailed explanation). A broken curve shows the Moho location 8 km shifted downward

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