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Pré-Publication, Document De Travail Année : 2023

Unveiling the deep plumbing system of a volcano by a reflection matrix analysis of seismic noise

Résumé

In geophysics, volcanoes are particularly difficult to image because of the multi-scale heterogeneities of fluids and rocks that compose them and their complex non-linear dynamics. By exploiting seismic noise recorded by a sparse array of geophones, we are able to reveal the magmatic and hydrothermal plumbing system of La Soufrière volcano in Guadeloupe. Spatio-temporal cross-correlation of seismic noise actually provides the impulse responses between virtual geophones located inside the volcano. The resulting reflection matrix can be exploited to numerically perform an auto-focus of seismic waves on any reflector of the underground. An unprecedented view on the volcano's inner structure is obtained at a half-wavelength resolution. This innovative observable provides fundamental information for the conceptual modeling and high-resolution monitoring of volcanoes.
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Dates et versions

hal-04268602 , version 1 (02-11-2023)

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  • HAL Id : hal-04268602 , version 1

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Elsa Giraudat, Arnaud Burtin, Arthur Le Ber, Mathias Fink, Jean-Christophe Komorowski, et al.. Unveiling the deep plumbing system of a volcano by a reflection matrix analysis of seismic noise. 2023. ⟨hal-04268602⟩
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