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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Reconstructing surface eruptive sequence of 2018 small phreatic eruption of Iwo-yama volcano, Kirishima Volcanic Complex, Japan, by infrasound cross-correlation analysis

Fig. 2

Waveform and spectrogram of infrasound recorded by MC2 and the snapshots that captured surface phenomena associated with the eruption by CAM1 and CAM2. a Infrasound waveform filtered 0.3–20 Hz. The vertical white lines represent data-missing periods due to equipment problems. b Spectrogram of the nonfiltered infrasonic signal calculated using 10.24-s sliding windows with 50% overlaps. We observed infrasonic powers in two frequency bands separated at 7 Hz (gray dashed line). The middle panels show snapshots of the South Craters taken by CAM1 just prior to the eruption (c) and at the onset of the eruption (d). The bottom panels are snapshots taken by CAM2 that show the West Crater before the eruption (e) and emitting faint steam, which indicated by black arrows (f)

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