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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

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. 1

Tectonic maps in and around Hokkaido, Japan. a Tectonic map in and around Japan. Our study area of Hokkaido, the northernmost island in Japan, is colored in pink. HCZ: the Hidaka Collision Zone. b Geological units forming Central Hokkaido (Kimura 1994; Ueda 2016) and seismic reflection and refraction/wide-angle reflection lines of the 1998–2000 Hokkaido Transect (Iwasaki et al. 2001, 2004; RGES 2002a, b). Other reflection lines in the southern part of Central Hokkaido (e.g., Arita et al. 1998; Tsumura et al. 1999; Ito 2000, 2002) are also shown. A yellow circle indicates the epicenter of the Hokkaido Eastern Iburi earthquake (M = 6.7) on Sep. 6, 2018 by Japan JMA (2018a). OB: Oshima Belt; SYB: Sorachi-Yezo Belt; HB: Hidaka Belt; TB: Tokoro Belt; Iz: Idon’nappu zone: Hmz: Main zone of the HB; Ynz: Yubetsu-Nakanogawa zone of the HB; Kz: Kamuikotan zone; Hmr: Hidaka metamorphic rocks; HMT: Hidaka Main Thrust

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