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Earth, Planets and Space
Fig. 13 | Earth, Planets and Space

Fig. 13

From: Time variations in the chemical and isotopic composition of fumarolic gases at Hakone volcano, Honshu Island, Japan, over the earthquake swarm and eruption in 2015, interpreted by magma sealing model

Fig. 13

South to North cross section of Hokone volano. a Star mark: pressure source appeared in 2015 (Itadera et al. 2016). M: degassing magma, R: magmatic gas reservoir, S: sealing zone, B: hydrothermal system made of brittle crust, L: local meteoric water, G: fumarolic gas, Ko: Komagatake central cone, Ka: Kamiyama central cone, Ki: Mt. Kintoki, Cross-marks: occurrence of earthquakes. The rectangle of broken line indicates the region drawn in b. b Hydrothermal system beneath the fumarole of N, S, C and borehole (Bh). The shallow part of the hydrothermal system is reduced (Red), whereas the relatively deep part is oxidized (Oxi). The boundary between the region of Red and Oxi has not been certainly determined

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