Fig. 3
Total discharged and cumulative mass estimates for the 2018 eruption of Kusatsu-Shirane Volcano. a Log–log plot of mass/area (g/m2) versus area (m2) of the isomass map and cumulative mass (%) using the segment integration method (Takarada et al. 2001). The regression lines are subdivided into eight segments (shown in different colors), and each segment was used in the calculation. The estimated masses of each segment are shown in the lower part of the figure. Black solid circles indicate field data. b Semilog plot of mass/area (g/m2) versus square root area (km) of the isomass map and the cumulative mass (%) using the Weibull fitting method (Bonadonna and Costa 2012). Black solid circles and dashed lines indicate field data and the fitting curve, respectively