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Earth, Planets and Space
Fig. 11 | Earth, Planets and Space

Fig. 11

From: Analyzing the continuous volcanic tremors detected during the 2015 phreatic eruption of the Hakone volcano

Fig. 11

Vertical velocity and acoustic signals recorded at OWD station during the eruption. a The raw seismometer signal (top) and spectrogram (bottom); b the raw signal (top) and spectrogram (bottom) from a microphone, for a period of 100 s starting from 04:05 on July 1, 2015. The acoustic signal was corrected using the result of sensor calibration (Yukutake et al. 2017). Each spectrogram was calculated by using a 1.28 s time window with 0.05 s intervals

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