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Fig. 3 | Earth, Planets and Space

Fig. 3

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

Fig. 3

Cross-correlation analysis between MC1 and MC2. The vertical white lines represent periods with missing data. a Waveforms filtered 1–7 Hz (gray lines) and 7–20 Hz (black lines) recorded by MC1 and MC2. b The \(t-\tau\) plot of the cross-correlation coefficient in the frequency range of 1–7 Hz. The signal starts with the eruption onset at 15:39:45 on April 19, and the correlation values increase from 19:19:40 on April 19 (black dotted line). c The cross-correlation coefficient in the frequency range of 7–20 Hz. The correlation peaks appear with the eruption onset and re-intensify after around 3:57 on April 20 (black dotted line)

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