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Eruption dynamics of the 23 February 2013 event at Mt. Etna

Citation

Potter, NJ and Carey, RJ and Andronico, D and Costantini, L, Eruption dynamics of the 23 February 2013 event at Mt. Etna, Journal of Volcanology and Geothermal Research, 384 pp. 241-250. ISSN 0377-0273 (2019) [Refereed Article]


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DOI: doi:10.1016/j.jvolgeores.2019.07.021

Abstract

Volcanic activity at Mt. Etna in the last decade has mostly been manifested by sequences of short paroxysmal episodes characterised by powerful lava fountains and high eruption columns. On the 23 February 2013, an exceptionally intense episode occurred at the New South-East Crater, producing a fountain > 800 m high (among the highest ever recorded at Etna) and a ∼9 km eruption column that dispersed ash > 400 km from the vent. Textural and petrographic analyses of lapilli revealed that magma erupted during the high-intensity phase is characterised by low microlite contents (<7 area%), high vesicularity (7683%), and high vesicle number densities (68.2  106 cm-3). The short-lived initial Strombolian explosions removed viscous magma from the conduit, enabling the rapid ascent of gas-rich, microlite-poor magma and the eruption of an 800 m high fountain and 9 km high eruption column. For the 23 February eruption, the high vesicularity and low microlite content of the pyroclasts support the hypothesis that volatile-rich magma was the driver of the high intensity lava fountain. This eruptive event, along with three other recent events at Etna over the last 15 years, can be defined as subplinian based on eruption rate and column height, but also generated incandescent 8001000 m fountains. For these reasons, we propose to term this event, and others at Etna characterised by similar eruption features and parameters, as subplinian fountaining events.

Item Details

Item Type:Refereed Article
Keywords:Etna, eruption, volcano
Research Division:Earth Sciences
Research Group:Geology
Research Field:Volcanology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
UTAS Author:Potter, NJ (Miss Naomi Potter)
UTAS Author:Carey, RJ (Dr Rebecca Carey)
ID Code:134460
Year Published:2019
Funding Support:Australian Research Council (DE150101190)
Deposited By:Earth Sciences
Deposited On:2019-08-14
Last Modified:2019-08-15
Downloads:0

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