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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

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. 4

Heatmap during this sVLFE episode for a Stage 1, b Stage 2, c Stage 3, d Stage 4, e Stage 5, and f Stage 6. Other symbols are the same as in Fig. 2b. g Histogram of the sVLFEs. The height of the bars indicates the number of earthquakes per day, and the colors within the bars indicate the breakdown of the number of sVLFEs by area: eastern (E; sky-blue) and western (W; pink). The black, blue, and red lines are the cumulative number of sVLFEs in all catalogs, the E area, and the W area, respectively

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