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Fig. 12 | Earth, Planets and Space

Fig. 12

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. 12

Sequence at Hakone volcano before and after the earthquake swarm in May 2015. a Normal situation represented by the period in 2014. M: degassing magma, R: magmatic gas reservoir, S: sealing zone, B: hydrothermal system made of brittle crust, G: fumarolic gas, PL: lithostatic pressure, PF: magmatic gas pressure, PC0 and PC1: gas pressure equilibrated with magma the composition of which is CO and C1 in Fig. 11. b Sealing zone is restricting the magmatic gas transport to hydrothermal system, corresponding to the period in few months prior to May 2015. Air invasion was allowed into hydrothermal system. c Break of sealing zone in May 2015. A large number of earthquakes (cross-marks) happened in hydrothermal system

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