Dome-like behaviour at Mt. Etna: The case of the 28 December 2014 South East Crater paroxysm

C Ferlito,V Bruno,D Scandura,M Mattia,M Coltorti,G Salerno,T Caltabiano

doi:10.1038/s41598-017-05318-9

C Ferlito, V Bruno + Show 5 more

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https://doi.org/10.1038/s41598-017-05318-9

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Abstract

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 ~3 × 106 m3 of lava was erupted. Two basaltic lava flows discharged at a rate of ~370 m3/s, reaching a maximum distance of ~5 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 SO2 flux 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.

Highlights

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 ~3 × 106 m3 of lava was erupted
Continuous GPS (CGPS) network (Supplementary Fig. S5) data were used to: (i) explore and model the source of the ground deformation pattern preceding the paroxysm of 28 December 2014; (ii) explore and model the displacements following the paroxysm
The ground deformation patterns in the period between 21 August–26 December and 27–29 December 2014 are shown in Fig. 3a,c and in Fig. 3b,d respectively

Summary

Introduction

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 ~3 × 106 m3 of lava was erupted. The integrated data from field observations, geophysics, gas geochemistry and rock petrochemistry, allow inferring that the eruptive mechanism of the event of 28 December 2014, differs from open conduit paroxysms and dyke-fed eruptions but instead points to the behaviour of an exogenous dome. Such a behaviour, anomalous for basaltic systems, is physically detailed here for the very first time on Mt. Etna. One peculiar feature of this paroxysm is the newly opened fracture, characterized by the alignment of huge niches similar to avalanche

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