Monitoring volcanoes using seismic noise correlations Surveillance des volcans à partir du bruit de fond sismiqueReportar como inadecuado




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1 IPGP - Institut de Physique du Globe de Paris 2 Earthquake Research Institute 3 Isterre - Ondes et Structures ISTerre - Institut des Sciences de la Terre

Abstract : In this article, we summarize some recent results of measurements of temporal changes of active volcanoes using seismic noise cross-correlations. We first present a novel approach to estimate volcano interior temporal seismic velocity changes. The proposed method allows to measure very small velocity changes ≈ 0.1% with a time resolution as small as one day. The application of that method to Piton de la Fournaise Volcano La Réunion Island shows velocity decreases preceding eruptions. Moreover, velocity changes from noise cross-correlations over 10 years allow to detect transient velocity changes that could be due to long-lasting intrusions of magma without eruptive activity or to pressure buildup associated to the replenishing of the magma reservoir. We also present preliminary results of noise cross-correlation waveform perturbation associated with the occurrence of dike injection and volcanic eruption. We show that such an analysis leads us to locate the areas of dike injection and eruptive fissures at Piton de la Fournaise Volcano. These recent results suggest that monitoring volcanoes using seismic noise correlations should improve our ability to forecast eruptions, their intensity and thus potential environmental impact.

keyword : Volcano monitoring Seismic noise Volcanic eruption forecast





Autor: Florent Brenguier - Daniel Clarke - Yosuke Aoki - Nikolai M. Shapiro - Michel Campillo - Valérie Ferrazzini -

Fuente: https://hal.archives-ouvertes.fr/



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