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

Autor:	Giraudat, Elsa, Burtin, Arnaud, Ber, Arthur Le, Fink, Mathias, Komorowski, Jean-Christophe, Aubry, Alexandre
Rok vydání:	2023
Předmět:	Physics - Geophysics Electrical Engineering and Systems Science - Image and Video Processing Physics - Applied Physics
Druh dokumentu:	Working Paper
Popis:	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 Soufri\`ere 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. Comment: 32 pages, 9 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2311.01296 Zobrazit plný text záznamu View this record from Arxiv