Dyke intrusion and stress-induced collapse of volcano flanks: The example of the 2018 event at Mt. Etna (Sicily, Italy)

Magmatic intrusions, eruptions and flank collapses are frequent processes of volcano dynamics, inter-connected at different space and time scales. The December 2018 recrudescent episode at Mt. Etna is an exemplary case where a sudden intrusive event culminated with a short eruption, intense seismici...

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Bibliographic Details
Published in:Scientific reports 2020-04, Vol.10 (1), p.6373-6373, Article 6373
Main Authors: Giampiccolo, E., Cocina, O., De Gori, P., Chiarabba, C.
Format: Article
Language:English
Subjects:
704/2151
704/4111
Earthquakes
Eruptions
Humanities and Social Sciences
Magma
multidisciplinary
Science
Science (multidisciplinary)
Seismic activity
Volcanic eruptions
Volcanoes
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Summary:Magmatic intrusions, eruptions and flank collapses are frequent processes of volcano dynamics, inter-connected at different space and time scales. The December 2018 recrudescent episode at Mt. Etna is an exemplary case where a sudden intrusive event culminated with a short eruption, intense seismicity and a shallow large strike-slip earthquake at the edge of the eastern sliding flank. Here, we show that high resolution velocity models and transient changes of V P and V P /V S resolve the magma intrusion through a dyke and local stress increase at the base of the unstable flank, inducing the collapse. Episodic brittle faulting occurs at the edge of the sliding sector, locally contributed by high fluid pressure. The feedback between magma ascent, stress changes and flank collapse is driving the volcano dynamics, with processes ranging from long term to transient episodes.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-63371-3