Three‐dimensional shear velocity anisotropic model of Piton de la Fournaise Volcano (La Réunion Island) from ambient seismic noise

A three-dimensional shear velocity anisotropic model of Piton de la Fournaise Volcano (La Réunion Island) reveals distinct high-velocity anomalies beneath the volcano, likely linked to geological features such as an old intrusive body and a solidified magma chamber. The study used four years of seismic noise data from the volcanic network to measure Rayleigh and Love wave dispersion curves, which were then inverted into velocity maps. These maps identified three high-velocity anomalies, including one below the summit corresponding to the current dyke intrusion zone and another beneath the 'Grandes Pentes' and 'Grand Brûlé' areas, indicative of a dismantled volcanic structure. Radial anisotropy further highlighted the recent lava flow accumulation above sea level and ancient vertical dyke intrusions below sea level. This model provides critical insights into the volcano's internal structure and its evolutionary history.

Mordret, A., Rivet, D., Landès, M., & Shapiro, N. M. (2015). Three‐dimensional shear velocity anisotropic model of Piton de la Fournaise Volcano (La Réunion Island) from ambient seismic noise. Journal of Geophysical Research: Solid Earth, 120(1), 406–427. Portico. https://doi.org/10.1002/2014jb011654