<i>b</i>-Value Maps for Some Volcanoes Worldwide: What Do We Learn?

Abstract We evaluate, using the method of Godano et al. (2022), the b-value 3D maps for some volcanoes worldwide: Cordillera de Guanacaste, Costa Rica; Etna, Italy; Hawaii, United States; Santorini, Greece; and Yellowstone, United States. The original method (using unstructured gridding in the process of building the cells of the volume) has been modified introducing a new technique for the estimation of the completeness magnitude mc based on the evaluation of the variability coefficient cv. This provides a very efficient estimation of mc. All the b-values distributions show an anomaly (larger than the others) associated with a hydrothermal system. This suggests that our method could be efficient in characterizing the rheological behavior and the temperature of the volcanic rocks.