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

Fig. 4

From: Shallow tectonic tremor activities in Hyuga-nada, Nankai subduction zone, based on long-term broadband ocean bottom seismic observations

Fig. 4

Spatiotemporal evolution of shallow tremors during each episode. a–f Circles in red and black dots represent shallow tremors and shallow VLFEs (Tonegawa et al. 2020), respectively. The episode duration is displayed in the upper right corner of each figure. Blue squares indicate OBS stations used for monitoring during each episode. Other contours and symbols are the same as those in Fig. 1. g Spatial distribution of activity before and after the May 30, 2015 Ogasawara Earthquake (Mw 7.8) during Episode 5. The left and right panels show the epicenter distributions before and after the Mw 7.8 earthquake, respectively. h Spatiotemporal plot of shallow tremors during Episode 5 projected on the W–E cross section shown in Fig. The star indicates the timing of the Ogasawara Earthquake (Mw 7.8) and the event colors correspond to those in g

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