A multiparameter approach to volcano monitoring based on 4D analyses of seismo‐volcanic and acoustic signals: The 2008 Mt. Etna eruption

Abstract

Volcanic tremor and low frequency events, together with infrasound signals, can represent important precursory phenomena of eruptive activity because of their strict relationship with eruptive mechanisms and with fluid flows through the volcano's feeding system. Important variations of these seismo‐volcanic and infrasound signals, recorded at Mt. Etna volcano, occurred both in the medium‐ and short‐term before the eruption, that took place on 13 May 2008. The most significant changes were observed in the frequency content and location of LP events, as well as in volcanic tremor location, that allowed us to track the magma pathway feeding the 2008 eruptive activity. The infrasound showed three different families of events linked to the activity of the three active vents: North‐East Crater, South‐East crater and the eruptive fissure. The seismic and infrasonic variations reported, corroborated by ground deformations variations, help to develop a quantitative prediction and early‐warning system for effusive and/or explosive eruptions.

Insights into Mt. Etna’s Shallow Plumbing System from the Analysis of Infrasound Signals, August 2007–December 2009

“…11m, n) was systematically observed for the NEC events together with the previously observed frequency content of 0.8-2.3 Hz. Before the installation of the new sensor these low frequency values were observed only prior to the fire fountain of May 10, 2008 and on May 12-13, 2008 before the onset of the 2008-2009 eruption (DI GRAZIA et al 2009;SCIOTTO et al 2013). In both cases they were clearly recorded, although their frequency was not in the flat interval of the Monacor's response curve.…”

“…One of the most evident spectral content variations of the NEC events took place during the 2008-2009 eruption at the EF. It is difficult to determine the frequency range of the NEC events preceding the beginning of the eruption on 13 May 2008 because of the fire fountain on 10 May at the SEC and the consequent modifications of the NEC events (see DI GRAZIA et al 2009). After the eruption beginning at the EF, the NEC events during June 2008 were characterised by two peaks at *1 and 2 Hz, successively by three peaks at *0.8, 1.5 and 2.2 Hz (Fig.…”

“…It is noteworthy that pseudospectrograms, even if differently named, have been used several times in literature to analyse groups of ''discrete'' seismic and acoustic signals (SACCOROTTI et al 2007;MOLINA et al 2008;MORAN et al 2008;DI GRAZIA et al 2009;ALPARONE et al 2010).…”

“…We also wish to thank the FP7-MC-ITN project NEMOH (GA Number: 289976) for its support. This work was partially funded by Grant INGV-DPC 2007-2009. SV wishes to thank IPGP, BQR, PPF for its support (IPGP contribution number).…”

3D integrated geophysical modeling for the 2008 magma intrusion at Etna: Constraints on rheology and dike overpressure

“…The Earthquakes were accompanied by a gradual and intense increase in the intensity of volcanic tremor (Di Grazia et al, 2009). The volcanic activity was characterized by the opening of a fracture field on the northern flank of the volcano (Fig.…”