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

Fig. 4

From: Continuous seismic monitoring of Nishinoshima volcano, Izu-Ogasawara, by using long-term ocean bottom seismometers

Fig. 4

Vertical component records of NI21 and NI12, and event detection using the STA/LTA method. All traces have the same amplitude scale. Left: seismic records with a duration of 10 min of vertical components for NI21. The records are band-passed from 4 to 8 Hz. Red lines indicate detection of events using the STA/LTA method. In March and April 2015, smaller amplitudes were observed and the amplitude increased later. Intervals between events lengthened from beginning in August 2015. Right: seismic records with a duration of 10 min of vertical components for NI12. The records are band-passed from 4 to 8 Hz. Red lines indicate detection of events using the STA/LTA method. The number of events decreased and no events were detected from November 25, 2015

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