Fig. 8

a Cumulative magma volume derived from Yokodake volcano. Dotted and dashed lines, respectively, indicate the eruption rate at 34 ky and 3.4 ky. b Estimated magma eruption rate of Yokodake volcano, northern Yatsugatake, and all Yatsugatake volcanoes obtained using our data and earlier results (Kawachi et al. 1978; Oishi and Suzuki 2004; Okuno and Kobayashi 2010; Nishiki et al. 2011; Oishi 2015). Circles represent the eruption rate of Yokodake during the past 34 ky and 3.4 ky. The triangle and square, respectively, represent the eruption rates of northern Yatsugatake and Yatsugatake volcanoes during a 0.5-My period