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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Rupture processes of the 2021 and 2022 Fukushima-oki earthquakes: adjacent events on the complex fault system in the subducting slab

Fig. 1

a Seismotectonic map with the station distribution around the source region. The black rectangle in the inset represents the region shown in the larger map. The blue lines show the trench axes (Iwasaki et al. 2015), and the blue broken line indicates the boundary between the North American and Eurasian plates (Bird 2003). The orange star and circles indicate the relocated epicenters of the mainshock and 24 h aftershocks, respectively, of the 2021 Fukushima-oki earthquake, and the red star and circles indicate those for the 2022 earthquake. The green stars show the epicenters of the large intraslab earthquakes in the JMA catalog since 2000. The focal mechanisms from the catalog of the Full Range Seismograph Network of Japan (F-net; Kubo et al. 2002) are shown near the epicenters. The sky-blue triangles and dark-blue squares represent the strong motion stations and geodetic stations, respectively. The gray broken lines denote the plate-boundary depths at intervals of 10 km (Iwasaki et al. 2015). The pink lines show the lower depth limit of the area where interplate earthquakes occur (Igarashi et al. 2001; Uchida et al. 2009). b Distribution of teleseismic stations (sky-blue triangles). The red star represents the epicenter of the 2022 Fukushima-oki earthquake

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