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The Most Intense Deflation of the Last Two Decades at Mt. Etna: The 2019–2021 Evolution of Ground Deformation and Modeled Pressure Sources
Author(s)
Language
English
Obiettivo Specifico
4V. Processi pre-eruttivi
5V. Processi eruttivi e post-eruttivi
Status
Published
JCR Journal
JCR Journal
Title of the book
Issue/vol(year)
/49 (2022)
ISSN
0094-8276
Publisher
Wiley-AGU
Pages (printed)
e2021GL095195
Issued date
2022
Subjects
Abstract
We analyze Global Navigation Satellite System (GNSS) and tilt data from the permanent monitoring networks of Etna volcano starting just after the 24 December 2018 eruption to an unusual two-month period of deflation in February–March, 2021, which coincided with the occurrence of 17 lava fountain episodes. Based on changes in slope in the GNSS displacement time series, we divide the period starting 7 months after the eruption into five phases, spanning the continued inflation of the edifice punctuated by short periods of effusive and strombolian activity (four phases) and a 2-month phase of intensive deflation. Our model indicates a progressive deepening of the internal pressure sources followed by a fast ascending source starting two-months before the first 2021 paroxysms. We explain these results in light of a recent volcanological model on the nature and behavior of magma ascending through the Etnean feeding system.
Sponsors
Open Access Funding provided by Istituto Nazionale di Geofisica e Vulcanologia within the CRUI-CARE Agreement.
References
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Ferro, A., Gambino, S., Panepinto, S., Falzone, G., Laudani, G., & Ducarme, B. (2011). High precision tilt observation at Mt. Etna Volcano, Italy. Acta Geophysica, 59, 618–632. https://doi.org/10.2478/s11600-011-0003-7Gambino, S., Aloisi, M., Di Grazia, G., Falzone, G., Ferro, A., & Laudani, G. (2019). Ground deformation detected by permanent tiltme-ters on Mt. Etna summit: The August 23-26, 2018, strombolian and effusive activity case. International Journal of Geophysics. https://doi.org/10.1155/2019/1909087Gambino, S., Falzone, G., Ferro, A., & Laudani, G. (2014). Volcanic processes detected by tiltmeters: A review of experience on Sicilian volca-noes. Journal of Volcanology and Geothermal Research, 271, 43–54. https://doi.org/10.1016/j.jvolgeores.2013.11.007Herring, T. A., Floyd, M. A., King, R. W., & McClusky, S. C. (2015). GLOBK: Global kalman filter VLBI and GPS analysis program. Reference manual. Mass. Inst. of Technol.Herring, T. A., King, R. W., Floyd, M. A., & McClusky, S. C. (2018). GPS analysis at MIT. GAMIT reference manual. Mass. Inst. of Technol.Palano, M., Rossi, M., Cannavò, F., Bruno, V., Aloisi, M., Pellegrino, D., et al. (2010). Etn@ref: A geodetic reference frame for Mt. Etna GPS networks. Annals of Geophysics, 53(4), 49–57.
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