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Authors: | Paonita, Antonio* Liuzzo, Marco* Salerno, Giuseppe* Federico, Cinzia* Bonfanti, Pietro* Caracausi, Antonio* Giuffrida, Giovanni Bruno* La Spina, Alessandro* Caltabiano, Tommaso* Gurrieri, Sergio* Giudice, Gaetano* |
Title: | Intense overpressurization at basaltic open-conduit volcanoes as inferred by geochemical signals: The case of the Mt. Etna December 2018 eruption | Journal: | Science Advances | Series/Report no.: | /7 (2021) | Publisher: | AAAS | Issue Date: | 1-Sep-2021 | DOI: | 10.1126/sciadv.abg6297 | Keywords: | noble gas geochemistry degassing model magma recharge pressure buildup |
Subject Classification: | solid earth | Abstract: | The balance between the amount of gas coexisting with mantle-derived magmas at depth and that emitted during intereruptive phases may play a key role in the eruptive potential of volcanoes. Taking the December 2018 eruption at Mt. Etna volcano as a case study, we discuss the geochemical data streams observed. The signals indicate a long-lasting prelude stage to eruption, starting in 2017 and involving magma-fluid accumulation in the deep (>7 km bsl) reservoir, followed by pressure buildup in the system at intermediate depth (5 to 2 km bsl), 6 to 7 months before the eruption. A brief preeruptive phase marks the pressurization at 2 to 3 km below the craters. By comparing the magma and fluid recharge at depth to the measured volcanic degassing from the plume, we provide evidence that Mt. Etna was in a state of extreme overpressurization in the weeks before the onset of the eruption. |
Appears in Collections: | Article published / in press |
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File | Description | Size | Format | |
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Paonita GasImbalanceAtEtna 21.pdf | Open Access published article | 1.42 MB | Adobe PDF | View/Open |
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