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Fig. 3 | Earth, Planets and Space

Fig. 3

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. 3

Spatio-temporal distribution of the sVLFEs. a Along-trough and along-dip directions. The definition of these directions is presented in Fig. 1a. The white and yellow background colors indicate the periods of each stage. The circles indicate the projected locations of the sVLFEs with the color indicating the Kagan angle with respect to the reference focal mechanism shown in Fig. 1b. b Map view of the spatial distribution for rapid tremor reversals (RTRs) with different symbols for each episode. Only sVLFEs with Kagan angles with respect to the reference focal mechanism of less than 30° are plotted. The color of the circles (RTR-3 events) indicates the elapsed time from the first RTR-3 event. Gray, pink, and green vectors indicate the approximate migration direction for RTR-1 and 2, RTR-3, and RTR-4, respectively. Other symbols are the same as in Fig. 2b

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