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Giudicepietro, Flora; López, Carmen; Macedonio, Giovanni; Alparone, Salvatore; Bianco, Francesca; Calvari, Sonia; De Cesare, Walter; Delle Donne, Dario; Di Lieto, Bellina; Esposito, Antonietta M.; Orazi, Massimo; Peluso, Rosario; Privitera, Eugenio; Romano, Pierdomenico; Scarpato, Giovanni; Tramelli, Anna
Scientific reports, 06/2020, Letnik: 10, Številka: 1Journal Article
Abstract Two paroxysmal explosions occurred at Stromboli volcano in the Summer 2019, the first of which, on July 3, caused one fatality and some injuries. Within the 56 days between the two paroxysmal explosions, effusive activity from vents located in the summit area of the volcano occurred. No significant changes in routinely monitored parameters were detected before the paroxysmal explosions. However, we have calculated the polarization and the fractal dimension time series of the seismic signals from November 15, 2018 to September 15, 2019 and we have recognized variations that preceded the paroxysmal activity. In addition, we have defined a new parameter, based on RSAM estimation, related to the Very Long Period events, called VLP size , by means of which we have noticed significant variations through the whole month preceding the paroxysm of July 3. In the short term, we have analyzed the signals of a borehole strainmeter installed on the island, obtaining automatic triggers 10 minutes and 7.5 minutes before the July 3 and the August 28 paroxysms, respectively. The results of this study highlight mid-term seismic precursors of paroxysmal activity and provide valuable evidence for the development of an early warning system for paroxysmal explosions based on strainmeter measurements.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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