Fig. 2
From: Monochromatic infrasound waves observed during the 2014–2015 eruption of Aso volcano, Japan
Surficial phenomena and corresponding infrasound waveforms. Several types of surficial eruptive events (a Strombolian explosion; b ash ejection; and c emission of gas–steam mixtures) with their corresponding 10-min infrasound waveforms observed at ACM. All pictures in a–c were taken from the SW or SSW rim of the crater at 19:55 on April 18, 2015, 10:57 on January 13, 2015, and 9:23 on March 20, 2015, respectively. Timings of these snapshots were marked in the diagrams