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Progress in Earth and Planetary Science
Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

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

Fig. 8

The estimated velocity structure along the plate interface. Red and black dots reflect the relocated hypocenters within 2.5 km from the plate interface and the deep low-frequency tremor (Maeda and Obara 2009; Obara et al. 2010), respectively. White contours show the iso-depth of plate interface with a 10 km increment (Nakanishi et al. 2018). a P-wave velocity structure. Black lines show the iso-velocity contours from 5 to 8 km/s with 0.5 km/s increments. b S-wave velocity structure. Black lines show the iso-velocity contours from 3 to 4.5 km/s with 0.25 km/s increments. c Vp/Vs structure. Black lines show the iso-value contours from 1.7 to 1.9 with 0.1 increments. Thick dashed lines correspond to the isotherm contour for 150 and 350 °C (Oleskevich et al. 1999). Other symbols are the same as Fig. 1a

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