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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

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. 5

Velocity structure model by ray-tracing technique. a Entire velocity structure model. The shallower part (< 15–20-km depth) is based on the model by Iwasaki et al. (2004). Thick brown lines of “R1” to “R3” are layer boundaries well correlated with the seismic reflection image in Fig. 2c. Shot positions used in the forward analysis are indicated by triangles. A white line is the location of the 8-km deeper Moho (see the text for explanation). b Direct comparison of velocity model with seismic reflection image. The velocity model in a is superimposed on the depth-migrated section in Fig. 2c with the same notations and interpretations

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