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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Monochromatic infrasound waves observed during the 2014–2015 eruption of Aso volcano, Japan

Fig. 4

Power spectra for Aso infrasound signals. Power spectra of a 10-min and 30-s records (black and gray lines, respectively) for the times of various surficial phenomena (a Strombolian explosion; b ash ejection; and c emission of gas-steam mixtures). Same data of Fig. 2 are used to calculate the spectra. Red line in a is data on March 25, 2015, when the intense Strombolian explosions and gas exhalations were observed

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