Timing of a large volcanic flank movement at Piton de la Fournaise Volcano using noise-based seismic monitoring and ground deformation measurements - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Geophysical Journal International Année : 2013

Timing of a large volcanic flank movement at Piton de la Fournaise Volcano using noise-based seismic monitoring and ground deformation measurements

Résumé

In volcanic domains, magma transport and pressure build-up induce high stress-strain perturbations in the surrounding volcanic edifice that may lead to volcanic flank movements and possible instability. In this study, we focus on the 2007 March-April episode of volcanic activity at Piton de la Fournaise (PdF) Volcano, La R'eunion Island. This episode was associated with a large volume of emitted lava (240 × 106 m3) and a 340-m caldera collapse. We present observations of continuous seismic velocity changes measured using cross-correlations of ambient seismic noise over 10 yr at PdF. Overall, we observe a large velocity reduction starting a few days prior to the major 2007 April 2 eruption. Comparison of seismic velocity change measurements with observations of deformation from InSAR and GPS shows that the seismic velocity reduction coincided with a widespread flank movement starting at the time of injection of magma to feed an initial eruption, a few days before the 2007 April 2 eruption. We emphasize the potential of noise-based seismic velocity change measurements, together with geodetic observations, to detect and monitor possibly hazardous slope instabilities.
Fichier principal
Vignette du fichier
ggt276.pdf (2.62 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-01067203 , version 1 (07-08-2020)

Identifiants

Citer

D. Clarke, F. Brenguier, Jean-Luc Froger, N.M. Shapiro, Aline Peltier, et al.. Timing of a large volcanic flank movement at Piton de la Fournaise Volcano using noise-based seismic monitoring and ground deformation measurements. Geophysical Journal International, 2013, 195 (2), pp.1132-1140. ⟨10.1093/gji/ggt276⟩. ⟨hal-01067203⟩
290 Consultations
59 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More