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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Focal mechanisms and the stress field in the aftershock area of the 2018 Hokkaido Eastern Iburi earthquake (MJMA = 6.7)

Fig. 1

Map showing the Hokkaido corner. Inset shows the plate boundaries (Bird 2003) and the study area in rectangle. The region in and around the Hidaka Mountain Range (HMR) is the Hidaka Collision Zone (HCZ). Two broken lines show the eastern and the western boundaries of the HCZ. Closed triangles indicate active volcanoes. A red beach ball labeled as 2018 is the centroid moment tensor (CMT) solution of the 2018 Hokkaido Eastern Iburi earthquake (M6.7) (JMA 2018a). A red beach ball labeled as 1982 is the focal mechanism solution of the 1982 Urakawa-oki earthquake (M7.1) by using the first motion polarity of P wave (Moriya et al 1983). A red beach ball labeled as 1970 is the focal mechanism solution of the 1970 Hidaka earthquake (M6.7) by using the first motion polarity of P wave (Kita et al 2012). PA: Pacific plate, PH: Philippine Sea plate, EU: Eurasian plate, NA: North American plate, and KT: Kurile Trench

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