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Progress in Earth and Planetary Science
Fig. 9 | Progress in Earth and Planetary Science

Fig. 9

From: Seismicity distribution in the Tonankai and Nankai seismogenic zones and its spatiotemporal relationship with interplate coupling and slow earthquakes

Fig. 9

Velocity perturbation within the 5-km-thick layer. a At just above the plate interface and b between 10 and 15 km below the plate interface. White contours are depth to the plate boundary (Nakanishi et al. 2018). Dashed contours reflect velocity differences from − 10 to + 10% at 2.5% increments. The areas of strong (> 5 cm/year) interplate coupling estimated from onshore and offshore geodetic data are outlined by purple lines (Yokota et al. 2016). Areas outlined by gray, green, and orange lines reflect the fault location of deep SSE beneath the Kii channel (Kobayashi 2014), shallow SSE between 2017 and 2018 (Yokota and Ishikawa 2020), and recurrence shallow SSE (Araki et al. 2017; Ariyoshi et al. 2021), respectively. A, B, C, and D are the locations of substantial velocity anomalies discussed in the main text. Other symbols are the same as in Fig. 1

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