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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

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

Fig. 5

Temporal variations in a temperature, b electric self-potential, c non-filtered seismic signal (up–down component), d spectrogram of the seismic signal, e spectrogram of the acoustic signal, and f tilt for the period from 13:00 on 26 April to 01:00 on 29 April (JST). The timings of onset of change in SP and onset of hydrothermal water discharge are indicated by dotted and black lines, respectively. We judged the timing of hydrothermal water discharge on the basis of images from Camera 1 and temperature data for vent Fs. The timing of rainfall and drain-back are indicated by black lines and green inverted triangle at the top of the figure, respectively

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