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

Fig. 3

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

Fig. 3

Temporal variations in temperature and electric self-potential (SP) associated with intermittent hydrothermal water discharge. a Temperature of Fs and Fn, tangential (T) and radial (R) SP signals, and rainfall data for the period 20 April to 4 May 2021. Rainfall data were obtained from the Ebino site (Fig. 1). b Data for temperature and SP for the period 04:00 to 10:00 on 21 April (JST), with snapshots from the movie data. 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”) and active steam effusion (photograph “iii”) are shown. The onset time of change in SP was determined from the tangential component. c Data for temperature and SP data for the period 13:30 to 17:30 on 22 April 2021 (JST)

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