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Fig. 5 | Earth, Planets and Space

Fig. 5

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

Fig. 5

Nishinoshima volcano activity from March 2015 to May 2017 estimated using LT-OBS observations. Top: temporal variation in the amplitudes of the vertical component for NI21, NI12, NI13, and NI14. The positions of the four LT-OBSs were close and positioned southeastward of Nishinoshima. The maximum amplitudes for each 1-h record are plotted. Middle: the average durations of events detected using the STA/LTA method in 1 day. Lower: the accumulated number of detected events using the STA/LTA method in each day. The number of events is considered to be an indication of volcanic activity on Nishinoshima. There were approximately 1800 events during the eruption and decreased starting in July 2015. From the middle of April 2017, the number increased again and reached about 1400 at the end of May 2017

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