Amplitude and recurrence time analysis of LP activity at Mount Etna, Italy

Cauchie, Léna and Saccorotti, Gilberto and Bean, Christopher J. (2015) Amplitude and recurrence time analysis of LP activity at Mount Etna, Italy. Journal of Geophysical Research: Solid Earth, 120 (9). pp. 6474-6486. ISSN 2169-9313 Online ISSN 2169-9356

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Abstract

The aim of this work is to improve our understanding of the long-period (LP) source mechanism at Mount Etna (Italy) through a statistical analysis of detailed LP catalogues. The behavior of LP activity is compared with the empirical laws governing earthquake recurrence, in order to investigate whether any relationships exist between these two apparently different earthquake classes. We analyzed a family of 8894 events detected during a temporary experiment in August 2005. For that time interval, the LP activity is
sustained in time and the volcano did not exhibit any evident sign of unrest. The completeness threshold of the catalogue is established through a detection test based on synthetic waveforms. The retrieved amplitude distribution differs significantly from the Gutenberg-Richter law, and the interevent times distribution does not follow the typical γ law, expected for tectonic activity. In order to compare these results with a catalogue for which the source mechanism is well established, we applied the same procedure to a data set from Stromboli Volcano, where recurrent LP activity is closely related to very-long-period pulses, in turn associated with the summit explosions. Our results indicate that the two catalogues exhibit similar behavior in terms of amplitude and interevent time distributions. This suggests that the Etna’s LP signals are most likely driven
by stress changes caused by an intermittent degassing process occurring at depth, similar to that which drives the summit explosions at Stromboli Volcano.

Item Type: Article
Divisions: School of Cosmics Physics > Geophysics
Date Deposited: 01 Nov 2021 12:42
Last Modified: 14 Dec 2022 14:54
URI: https://dair.dias.ie/id/eprint/1167

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