The eruptions of December 2015 and May 2016 at Voragine crater were among the most explosive recorded during the last two decades at Mt. Etna volcano. Here, we present data coming from geophysics (infrasound, LP, VLP, volcanic tremor, VT earthquakes, ground deformations) and petrology (textural and micro-analytical data on plagioclase and olivine crystals) to investigate the pre-eruptive magma storage and transfer dynamics leading to these exceptional explosive eruptions. Integration of all the available data has led us to constrain chemically, physically and kinetically the environments where magmas were stored before the eruption, and how they have interacted during the transfer en-route to the surface. Although the evolution and behavior of volcanic phenomena at the surface was rather similar, some differences in storage and transfer dynamics were observed for 2015 and 2016 eruptions. Specifically, the 2015 eruptions have been fed by magmas stored at shallow levels that were pushed upward as a response of magma injections from deeper environments, whereas evidence of chemical interaction between shallow and deep magmatic environments becomes more prominent during the 2016 eruptions. Main findings evidence the activation of magmatic environments deeper than those generally observed for other recent Etnean eruptions, with involvement of deep basic magmas that were brought to shallow crustal levels in very short timescales (∼1 month). The fast transfer from the deepest levels of the plumbing system of basic, undegassed magmas might be viewed as the crucial triggering factor leading to development of exceptionally violent volcanic phenomena even with only basic magma involved.

CANNATA A, DI GRAZIA G, GIUFFRIDA M, GRESTA S, PALANO M, SCIOTTO, et al. (2018). Space-Time Evolution of Magma Storage and Transfer at Mt. Etna Volcano (Italy): the 2015-2016 Re-Awakening of Voragine Crater'. GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS [10.1002/2017GC007296].

Space-Time Evolution of Magma Storage and Transfer at Mt. Etna Volcano (Italy): the 2015-2016 Re-Awakening of Voragine Crater'

PALANO M;
2018-01-01

Abstract

The eruptions of December 2015 and May 2016 at Voragine crater were among the most explosive recorded during the last two decades at Mt. Etna volcano. Here, we present data coming from geophysics (infrasound, LP, VLP, volcanic tremor, VT earthquakes, ground deformations) and petrology (textural and micro-analytical data on plagioclase and olivine crystals) to investigate the pre-eruptive magma storage and transfer dynamics leading to these exceptional explosive eruptions. Integration of all the available data has led us to constrain chemically, physically and kinetically the environments where magmas were stored before the eruption, and how they have interacted during the transfer en-route to the surface. Although the evolution and behavior of volcanic phenomena at the surface was rather similar, some differences in storage and transfer dynamics were observed for 2015 and 2016 eruptions. Specifically, the 2015 eruptions have been fed by magmas stored at shallow levels that were pushed upward as a response of magma injections from deeper environments, whereas evidence of chemical interaction between shallow and deep magmatic environments becomes more prominent during the 2016 eruptions. Main findings evidence the activation of magmatic environments deeper than those generally observed for other recent Etnean eruptions, with involvement of deep basic magmas that were brought to shallow crustal levels in very short timescales (∼1 month). The fast transfer from the deepest levels of the plumbing system of basic, undegassed magmas might be viewed as the crucial triggering factor leading to development of exceptionally violent volcanic phenomena even with only basic magma involved.
2018
CANNATA A, DI GRAZIA G, GIUFFRIDA M, GRESTA S, PALANO M, SCIOTTO, et al. (2018). Space-Time Evolution of Magma Storage and Transfer at Mt. Etna Volcano (Italy): the 2015-2016 Re-Awakening of Voragine Crater'. GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS [10.1002/2017GC007296].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/636429
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