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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: The 2018 phreatic eruption at Mt. Motoshirane of Kusatsu–Shirane volcano, Japan: eruption and intrusion of hydrothermal fluid observed by a borehole tiltmeter network

Fig. 3

Tilt components recorded at 09:50–10:10 (JST) on 23 January 2018. a North–south and b east west components. Acausal low-pass filters with cut-off frequencies of 0.034 and 0.021 Hz were applied to the tilt records of JTS-33 (KSE, KSS, KSW, N.KSHV, N.KSYV, and N.KSNV) and 701-2A (YNW and JIE), respectively. c Raw vertical ground velocity waveform at KSS. See Fig. 1 and Table 1 for station names and locations. We term the inflation and deflation phases as phase 1 and phase 2, respectively. The time of eruption onset was estimated by Yamada et al. (2021)

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