Twenty‐five years of continuous borehole tilt and vertical displacement data at Mount Etna: Insights on long‐term volcanic dynamics

Bonaccorso, Alessandro; Bonforte, Alessandro; Gambino, Salvatore

doi:10.1002/2015gl066517

Cited by 15 publications

(10 citation statements)

References 68 publications

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“…GPS data for the near‐surface strain rate come from Palano et al (2012) and Devoti et al (2017). The geodetic baseline has been obtained by merging previous measurements which are included in Bonaccorso et al (2015). The GNSS baselines in Figure 6 are included in the database of the Osservatorio Etneo, Istituto Nazionale di Geofisica e Vulcanologia (https://doi.org/10.6084/m9.figshare.12949712).…”

Section: Data Availability Statementmentioning

confidence: 99%

Slab Detachment, Mantle Flow, and Crustal Collision in Eastern Sicily (Southern Italy): Implications on Mount Etna Volcanism

et al. 2020

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New data and interpretations of the geodynamics of eastern Sicily point to deep crustal shortening taking place in the area. Reconstructions of the lithospheric system, seismicity distribution, and stress state in the crust indicate that deformation is expressed by a large thrust-ramp cutting through the entire lower plate. The tectonic structure is propagating directly beneath the Mount Etna volcano, one of the few active volcanoes in Europe. Geostructural interpretation of tomographic sections allows for interpretations of the compressional structure as originating in response to trench-parallel breakoff of the Ionian slab. Following the simple assumption that if a slab retreats, it must either be compensated or alternatively pushed by the fore-arc mantle, we argue that the opening of a gateway in the slab has encouraged the fore-arc mantle to flow toward the Mount Etna region. Mantle mobilization has had a twofold influence on both magmatic source mixing and the inception of underplating processes beneath the Mount Etna. A shortening prevailing over extension in the crust below the volcano seems to have a significant impact on the dynamics of the Mount Etna volcanic system, which manifested through anomalous signals over the last thousands of years. Since a tectonic inversion of previous dilatational magma pathways is expected in such a converging setting, the documented variations are believed to be consistent with a volcano experiencing a declining phase. Comparison with other extinct volcanic systems in the southern Tyrrhenian margin, lying atop a detached slab and involved in contraction, provides insights into the evolution of Mount Etna.

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Section: Data Availability Statementmentioning

confidence: 99%

Slab Detachment, Mantle Flow, and Crustal Collision in Eastern Sicily (Southern Italy): Implications on Mount Etna Volcanism

et al. 2020

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“…This did not culminate into an eruption yet (if not for the opening of the 7 August summit vent). Thus, the volcano's feedback to increased shallow magma emplacement (as indicated by increasing SO 2 fluxes) may be different from time to time, perhaps in response to distinct stress regimes prevailing on the upper part of the edifice, and/or temporally varying feedbacks between magma ascent and rates of gravitational spreading of the mobile eastern flank [79,80].…”

Section: Discussionmentioning

confidence: 99%

Changes in SO2 Flux Regime at Mt. Etna Captured by Automatically Processed Ultraviolet Camera Data

et al. 2019

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We used a one-year long SO2 flux record, which was obtained using a novel algorithm for real-time automatic processing of ultraviolet (UV) camera data, to characterize changes in degassing dynamics at the Mt. Etna volcano in 2016. These SO2 flux records, when combined with independent thermal and seismic evidence, allowed for capturing switches in activity from paroxysmal explosive eruptions to quiescent degassing. We found SO2 fluxes 1.5–2 times higher than the 2016 average (1588 tons/day) during the Etna’s May 16–25 eruptive paroxysmal activity, and mild but detectable SO2 flux increases more than one month before its onset. The SO2 flux typically peaked during a lava fountain. Here, the average SO2 degassing rate was ~158 kg/s, the peak emission was ~260 kg/s, and the total released SO2 mass was ~1700 tons (in 3 h on 18 May, 2016). Comparison between our data and prior (2014–2015) results revealed systematic SO2 emission patterns prior to, during, and after an Etna’s paroxysmal phases, which allows us to tentatively identify thresholds between pre-eruptive, syn-eruptive, and post-eruptive degassing regimes.

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“…Tilt systematic monitoring has been carried out on the Etna by the Istituto Nazionale Geofisica e Vulcanologia-Osservatorio Etneo (INGV-OE) from the late 1970s, by using bubble borehole tiltmeters [11,12]. Up to the early 2000s, signals from tiltmeters in holes between 2 and 4 meters deep were affected by environmental noise (e.g., [13]).…”

Section: Introductionmentioning

confidence: 99%

Ground Deformation Detected by Permanent Tiltmeters on Mt. Etna Summit: The August 23-26, 2018, Strombolian and Effusive Activity Case

Gambino

Aloisi

Grazia

et al. 2019

International Journal of Geophysics

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Over the last few years, three tilt deep stations (27-30 meters) have been set up in the summit area of Mount Etna volcano. The aim of this challenging project is to record the ground deformations of the summit craters activity with high precision. We considered data related to the August 23-26, 2018, Strombolian and effusive activity. In this case, tiltmeters recorded variations in the order of 10−7 radians, not observed at the other stations. These changes suggest a shallow contraction source just south of the Southeast Crater. This result, related to the volcanic tremor source, points to the presence of a gas/magma reservoir feeding the Strombolian activity at 1200 m above sea level.

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Twenty‐five years of continuous borehole tilt and vertical displacement data at Mount Etna: Insights on long‐term volcanic dynamics

Cited by 15 publications

References 68 publications

Slab Detachment, Mantle Flow, and Crustal Collision in Eastern Sicily (Southern Italy): Implications on Mount Etna Volcanism

Slab Detachment, Mantle Flow, and Crustal Collision in Eastern Sicily (Southern Italy): Implications on Mount Etna Volcanism

Changes in SO2 Flux Regime at Mt. Etna Captured by Automatically Processed Ultraviolet Camera Data

Ground Deformation Detected by Permanent Tiltmeters on Mt. Etna Summit: The August 23-26, 2018, Strombolian and Effusive Activity Case

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