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Earth, Planets and Space
Fig. 10 | Earth, Planets and Space

Fig. 10

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. 10

Hypocenters of the main shock and aftershocks of the 2018 Hokkaido Eastern Iburi Earthquake. a Epicenter map. Brown solid line indicates the 1999–2000 refraction/wide-angle reflection profile of the Hokkaido Transect. All of the relocated aftershocks are shown by yellow circles. A large white circle is a hypocenter of the main shock determined by the present study. Projection line for the cross section in b is shown by a broken line. EBFIL: East Boundary Fault Zone of the Ishikari Lowland. b Cross section. Earthquakes within 15-km distance from the projection line (a) are plotted on our velocity model (Fig. 5a). A large white circle is a hypocenter of the main shock determined by the present study. c Cross section perpendicular to that in b. All of the relocated aftershocks are shown by yellow circles. Note clear seismicity gap at a depth of 18–25 km

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