Fig. 3From: Descent of tremor source locations before the 2014 phreatic eruption of Ontake volcano, JapanContinuous records at five stations (Fig. 2) from 11:40 to 12:20 on 27 September 2014. Each trace is normalized by its maximum amplitude. Blue axis marks the time window of waveforms used to estimate tremor locations (from 11:45 to 12:10)Back to article page