volcano seismicity; long-period activity; recurrence distributions; degassing process
Abstract :
[en] 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.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Cauchie, Léna ; Université de Liège - ULiège > Département de géologie > Géologie de l'environnement
Saccorotti, Gilberto; Istituto Nazionale di Geofisica e Vulcanologia > Pisa
Bean, Chris; Dublin Institute of Advanced Studies
Language :
English
Title :
Amplitude and Recurrence Time of LP activity at Mt. Etna, Italy
Publication date :
September 2015
Journal title :
Journal of Geophysical Research. Solid Earth
ISSN :
2169-9313
eISSN :
2169-9356
Publisher :
Wiley, Hoboken, United States - New Jersey
Volume :
120
Issue :
9
Pages :
6474-6486
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 289976 - NEMOH - Numerical, Experimental and stochastic Modelling of vOlcanic processes and Hazard: an Initial Training Network for the next generation of European volcanologists
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