Fig. 10From: Temporal variations in volumetric magma eruption rates of Quaternary volcanoes in JapanTemporal variations of SiO2 (red) and K-value (green) for volcanic glass in pumice of Akagi Volcano. K-value means abundance of K2O at SiO2 = 75.0 wt%. Observed patterns of geochemical fluctuation coincide with the sub-stages of P1, P2 and P3. The Ogo Pumice Flow eruption occurred at 60 ka and resulted in a summit-caldera formation. Modified from Yamamoto (2016)Back to article page