Mechanisms of Ash Generation at Basaltic Volcanoes: The Case of Mount Etna, Italy

A new model for ash generation at basaltic volcanoes, exemplified by Mount Etna, reveals that variations in magma mass flow rate govern the formation of volcanic ash. The study identifies three distinct mechanisms tied to eruptive styles—lava fountains, Strombolian activity, and ash explosions—by analyzing deposit features and ash characteristics from four historical eruptions (2001, 2006, 2007, 2010). It also demonstrates that tachylite magma constitutes a minor proportion of conduit residence time compared to sideromelane, aligning with observed ash composition during lava fountain episodes. This research advances the understanding of explosive basaltic volcanism and offers critical insights for hazard mitigation at similar volcanic systems.

Polacci, M., Andronico, D., de’ Michieli Vitturi, M., Taddeucci, J., & Cristaldi, A. (2019). Mechanisms of Ash Generation at Basaltic Volcanoes: The Case of Mount Etna, Italy. Frontiers in Earth Science, 7. https://doi.org/10.3389/feart.2019.00193