Fig. 12From: Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcanoMagnified plot of seismic and acoustic records within the red rectangle in Fig. 11a. a–c The raw, band-passed, and high-passed signals of the vertical component of a seismometer. d The raw signal of a microphone. The vertical blue and red lines show the onset times for the seismic signal and the impulsive infrasonic wave, respectivelyBack to article page