On the 28 December 2014, a violent and short paroxysmal eruption occurred at the South East Crater (SEC) of Mount Etna that led to the formation of huge niches on the SW and NE flanks of the SEC edifice from which a volume of â¼3 Ã 106m3of lava was erupted. Two basaltic lava flows discharged at a rate of â¼370 m3/s, reaching a maximum distance of â¼5 km. The seismicity during the event was scarce and the eruption was not preceded by any notable ground deformation, which instead was dramatic during and immediately after the event. The SO2flux associated with the eruption was relatively low and even decreased few days before. Observations suggest that the paroxysm was not related to the ascent of volatile-rich fresh magma from a deep reservoir (dyke intrusion), but instead to a collapse of a portion of SEC, similar to what happens on exogenous andesitic domes. The sudden and fast discharge eventually triggered a depressurization in the shallow volcano plumbing system that drew up fresh magma from depth. Integration of data and observations has allowed to formulate a novel interpretation of mechanism leading volcanic activity at Mt. Etna and on basaltic volcanoes worldwide.
|Titolo:||Dome-like behaviour at Mt. Etna: The case of the 28 December 2014 South East Crater paroxysm|
FERLITO, Carmelo [Conceptualization]
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||1.1 Articolo in rivista|