Fig. 8From: Preparatory and precursory processes leading up to the 2014 phreatic eruption of Mount Ontake, JapanTemporal changes in b-values. a Calculated b-values are represented by yellow squares. Uncertainties are indicated by vertical and horizontal error bars. b-value uncertainties (vertical error bars) were estimated following Shi and Bolt (1982). The horizontal error bars indicate the time window used for each b-value calculation (containing 400 events). Colored squares represent the selected magnitude–frequency distributions given by the triangles in (b). b Selected cumulative magnitude–frequency distributionsBack to article page