Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/15635
Authors: Firetto Carlino, Marco* 
Scarfì, Luciano* 
Cannavò, Flavio* 
Barberi, Graziella* 
Patanè, Domenico* 
Coltelli, Mauro* 
Title: Frequency-magnitude distribution of earthquakes at Etna volcano unravels critical stress changes along magma pathways
Journal: Communications Earth & Environment 
Series/Report no.: /3 (2022)
Publisher: Nature PG
Issue Date: 2022
DOI: 10.1038/s43247-022-00398-6
Subject Classification04.06. Seismology 
04.08. Volcanology 
Abstract: The high seismic productivity of volcanic areas provides the chance to investigate the local stress conditions with great resolution, by analysing the slope of the frequency-magnitude distribution of earthquakes, namely the b-value. Here we investigated the seismicity of Mt. Etna between 2005 and 2019, focusing on one of the largest known episodes of unrest in December 2018, when most of the intruding magma aborted, rather oddly, its ascent inside the volcano. We found a possible stress concentration zone along magma pathways, which may have inhibited the occurrence of a larger eruption. If the origin of such hypothetical loaded region is related to tectonic forces, one must consider the possibility that geodynamic processes can locally result in such rapid crustal strain as to perturb the release of magma. Strong b-value time-variations occurred a few days before the unrest event, suggesting new possibilities for investigating the volcano state and impending eruptions.
Appears in Collections:Article published / in press

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