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Fig. 10 | Progress in Earth and Planetary Science

Fig. 10

From: Fault geometry of M6-class normal-faulting earthquakes in the outer trench slope of Japan Trench from ocean bottom seismograph observations

Fig. 10

Hypocenter distribution and bathymetry relief along the Japan Trench. a Hypocenter distribution obtained in this study and previous studies (Obana et al. 2018, 2019, 2021), represented by colored circles. The thick dashed line indicates the Japan Trench axis. Yellow and blue shaded areas indicate the coseismic (Iinuma et al. 2012) and postseismic (Iinuma et al. 2016) slip areas of the 2011 Tohoku-oki earthquake, respectively. Contours for 5-, 20-, and 50-m coseismic slip and 0.4- and 0.8-m postseismic slip are indicated. The pink rectangle and arrows indicate the slow slip event in 2015 and horizontal displacement rates relative to the North American Plate, respectively (Honsho et al. 2019). The thick solid line rectangle indicates the area shown in panels (b) and (c). b Red relief bathymetry map (Chiba et al. 2008) showing epicenter distribution. Green circles represent the epicenters of earthquakes shallower than 14 km obtained in this study and previous studies (Obana et al. 2018, 2019, 2021). Arrows and white dashed rectangles indicate linear earthquake trends identified in previous studies in the northern and southern sections of the Japan Trench (Obana et al. 2018, 2021). The dashed white line indicates the Japan Trench axis. c Red relief bathymetry map without the epicenters

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