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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Multi-parametric observations of intermittent hydrothermal water discharge in West Crater of Iwo-Yama volcano, Kirishima Volcanic Complex, Japan

Fig. 4

Example of multi-observational data during a hydrothermal water discharge event [03:00 to 15:00 on 27 April 2021 (JST)]. The snapshots are from Camera 1 of vent Fs. The times of the photographs correspond to those in the time-series graph. a Temperature, b electric self-potential, c spectrogram of the seismic signal (up–down component), d spectrogram of the acoustic signal, and e tilt. Power spectral density (PSD; dB/Hz) is (μm/s)2/Hz for panel c and (Pa)2/Hz for panel d. The presented time series are part of Additional file 5: Fig. S1 and Additional file 1: Movie S1. The timings of onset of change in SP (dotted line), cessation of steam discharge (gray line labeled “i”), onset of hydrothermal water discharge (black line labeled “ii”), onset of active steam discharge (red line labeled “iii”), and onset of drain-back (photograph “iv”) are shown

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