Fig. 11

Characterization of fallout tephra deposit distribution used in the volume and mass estimation. a Exponential fit with multiple segments on a log(mass per unit area) versus log(area) plot. b Power-law fit. c Weibull fit. Solid circles indicate observed data, and open circles in a indicate data from inaccessible proximal areas at the crater rim based on various assumptions. Red and green lines indicate fitting curves for case 1 (not using proximal data) and case 2 (using proximal data), respectively. Solid and broken lines in a, c indicate maximum and minimum estimates, respectively