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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Spatio-temporal distribution of shallow very-low-frequency earthquakes between December 2020 and January 2021 in Kumano-nada, Nankai subduction zone, detected by a permanent seafloor seismic network

Fig. 2

Details of the sVLFE distribution. a Spatial distribution of the sVLFEs obtained in this and the previous studies. The DONET node and station codes are also shown. b Heatmap of the sVLFE activity for the entire episode. The background color and blue contours indicate the event number within 0.03° at each point. The contour interval is 5. The locations of the outer ridge, outer wedge, and inner wedge based on the bathymetry map are also shown. c Distribution of the cumulative moment release amount at each point. d Distribution of the moment release amount per event at each point. The open circles indicate the sVLFEs detected in this study. Note that only the areas where the event number within 0.03° larger than 5 are shown

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