Fig. 7From: Influence of hydrothermal recharge on the evolution of eruption styles and hazards during the 2018–2019 activity at Kuchinoerabujima Volcano, JapanRepresentative ash samples from Phase 2 (a–d) and Phase 4 (e–h) indicated by optical (a, d, e, h), X-ray (b and f) and backscattered electron (c and g) images. c, d A coarse euhedral sulfate crystal typical in Phase 2. g, h A fine euhedral sulfate crystals typical in Phase 4Back to article page