Fig. 2
From: A review of shallow slow earthquakes along the Nankai Trough
Spatial distributions of shallow slow earthquakes in Nankai. a Shallow tremors (Yamashita et al. 2015, 2021; Tamaribuchi et al. 2022), b shallow VLFEs (Asano et al. 2015; Nakano et al. 2018a; Takemura et al. 2022b, c; Yamamoto et al. 2022a) and c shallow SSEs (Yokota and Ishikawa 2020; Okada et al. 2022). In b and c, shallow VLFEs and SSEs detected by inland and offshore instruments are represented by orange and blue symbols, respectively. Gray dots, gray diamonds, and gray rectangles in a–c are deep tremors (Maeda and Obara 2009; Obara et al. 2010), VLFEs (Ito et al. 2009), and SSEs (Nishimura et al. 2013; Takagi et al. 2016, 2019). Deep SSEs in c include both long-term and short-term SSEs. d Spatial distribution of moderate-size ordinary interplate earthquakes (Takemura et al. 2020a) and small repeating earthquakes (Igarashi 2020). The catalog of Takemura et al. (2020a) contains ordinary earthquakes with Mw ≥ 4.3