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

Fig. 2

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

Fig. 2

Example waveform from the 2nd observation period showing: a the bandpass-filtered waveform in the tremor (2–4 Hz: black) and the VLFE (0.05–0.1 Hz: red) bands for 14 stations (numbers indicate the OBS stations shown in Fig. 1). The instrumental responses have been corrected. Red traces (VLFE band) are plotted only for stations where a signal was obtained above the noise level. Each trace was normalized based on the maximum amplitude and b bandpass-filtered waveforms for different bands observed by the BBOBS (OBS 10). The uppermost waveform is the raw data, while the others were filtered using the bands displayed to the left

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