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Earth, Planets and Space
Fig. 7 | Earth, Planets and Space

Fig. 7

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

Fig. 7

Temporal variation in electric self-potential (SP). a Temporal change in the amplitude of SP associated with hydrothermal water discharge, using data only from those events for which the occurrence of hydrothermal water discharge was confirmed by visual camera images. Gray lines correspond to events, and the colored line represents the average of all events. Black and red stars correspond to the timings of the cessation of steam effusion and the onset of hydrothermal water discharge, respectively (large stars show their averages). b Temporal change in the amplitude of SP without hydrothermal water discharge. Blue and yellow stars correspond to the timings of temperature rise and fall at vent Fs, respectively. c Particle motions of change in SP with the occurrence of hydrothermal water discharge. Note that the dipole lengths of the radial and tangential directions are the same (30 m). d Particle motions of change in SP without the occurrence of hydrothermal water discharge

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