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Fig. 1 | Earth, Planets and Space

Fig. 1

From: Long-term slow slip events with and without tremor activation in the Bungo Channel and Hyuganada, southwest Japan

Fig. 1

Index map showing the tectonic settings, seismicity, and station locations in the study area. Pink squares, blue triangles, and green squares represent the GNSS stations installed in this study, GEONET stations used, and reference stations (GEONET) defined, respectively. The solid curve shows the Nankai Trough and broken lines show the plate interface depth contours (digits are depths represented in km). Purple curves represent the rupture areas of the 1946 Nankai earthquake (Sagiya and Thatcher 1999) and the 1968 Hyuganada earthquake (Yagi et al. 1998). Green circles denote source areas of long-term slow slip events (Hirose et al. 1999; Kobayashi 2010, 2012; Yarai and Ozawa 2013; Takagi et al. 2016, 2019). Orange dots show epicenters of deep tremors from the NIED tremor catalog (Maeda and Obara 2009; Obara et al. 2010). Pink circles represent shallow tremors (Yamashita et al. 2015, 2021). Yellow circles show epicenters of repeating earthquakes (Uchida et al. 2020). Green and yellow stars denote the epicenters of the 2016 Kumamoto earthquake and the Hyuganada earthquake in May 2019, respectively. (Inset) Tectonic plate configurations around Japan islands. NA North America plate, PA Pacific plate, PH Philippine Sea plate, and AM Amurian plate

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