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Fig. 3 | Earth, Planets and Space

Fig. 3

From: Volcanic unrest at Hakone volcano after the 2015 phreatic eruption: reactivation of a ruptured hydrothermal system?

Fig. 3

Sequential change of a) CO2/H2S (C/S) molar ratio of fumarole gas emitted from a fumarole in Owakudani (Daita et al, 2019; Ohba et al, 2019), b) baseline length across Hakone volcano (Odawara – Susono2 + 20,747 m), c) cumulative number of deep low frequency events, and d) daily number of volcano-tectonic earthquakes in Hakone volcano. Durations of VAL 2 or more are shown as yellow hatches (May 6–Nov. 20 for 2015 and May 19–Oct. 9 for 2019) and durations of volcanic unrest defined as periods of baseline increase are shown as blue hatches (December 1, 2012–March 1, 2013, April 1–August 1 of 2015, May 1–Nov 1 of 2017 and March 1–August 1 of 2019)

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