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Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Shallow tremors observed using the OBSs during the observation period showing the a epicenter distribution of all shallow tremors obtained in this study (red circles) and all OBS stations used for the observation period (blue squares). Other contours and symbols are the same as those in Fig. 1. b Spatiotemporal plot projected on the W–E line shown in a. based on JST time (UTC+9). Blue filled stars indicate the timing of three major earthquakes that affected the shallow tremor activity. The shallow tremor activity is divided into Episodes (ep.) 1–6 according to the characteristics of the activity

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