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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

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. 3

Velocity structure for the refraction/wide-angle reflection lines of the Hokkaido Transect from travel time tomography (see Fig. 1). a 500 initial models randomly generated from a reference model (a blue line with white circles). b Tomographic image for the upper 20-km crust by averaging 500 final solutions. A contour interval is 0.25 km/s. Shot positions used in the tomography analysis are indicated by triangles. c Variance for the 500 final solutions with a contour interval of 0.1 km/s

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