In the framework of the French Government Laboratory of Excellence ClerVolc initiative, two experiments using a new millimeter-wave radar were carried out to retrieve various physical properties of the ash plumes, especially the mass loading parameters which are critical for the modelling of ash dispersal, as well as to study the internal dynamics of the plumes and their fallout. First measurements at Stromboli in 2015 using a 95 GHz cloud radar prototype with a fixed beam pointing above the crater characterized the distribution of plume internal reflectivities, plume widths and durations at unprecedented space-time resolutions. Combining radar in situ measurements with data modelling from a disdrometer and ash sampling on the ground further allowed the retrieval of ash concentration and gradients inside the plumes, and sometimes proximal fallout. Plume maximum ash concentration range fr...

Trabajo presentado en el European Geophysical Union, General Assembly 2019.

The Huayruro project aims at better understanding the physical and socio-economic impacts of the CE 1600 Plinian eruption of Huaynaputina in south Peru (VEI 6, 11-14 km3 ). Despite its global climatic impact, its regional consequences on the Inca population and constructions have been scarcely studied. In particular, the location of ten to fifteen settlements buried by the erupted deposits is not accurately known. Finizola et al. (2018) identified several buried settlements and ruins during several archeological and geophysical surveys during the 2014-2017 period within a 16 km radius of the crater (Coporaque, Calicanto, and Chimpapampa). Extending their work in May 2018, we used ground- penetrating radar at 400 et 200 MHz, magnetic gradiometry, multi-frequency conductivimetry and Structure from Motion (SfM) photogrammetry with multi-view stereo to further explore the sites of Coporaque ...

La erupción del volcán Huaynaputina de 1600 d. C. (en adelante VH-1600) es la más grande ocurrida en América del Sur en época histórica (Thouret et al., 1999, 2002; Adams et al., 2001). A partir del análisis de crónicas españolas, publicaciones recientes indican que la erupción se inició el 19 de febrero y culminó luego de casi 16 días, aproximadamente el 06 de marzo. La erupción tuvo un Índice de Explosividad 6 (Thouret et al., 1999, 2002; Adams et al. 2001), así como un impacto en el clima del planeta. Basado en estudios de dendrocronología, Bria et al. (1998) identificaron una anomalía térmica de 0.8 °C en el verano de 1601 en el hemisferio norte. Más recientemente, Stoel et al. (2015) demostraron una disminución de -1.13 °C, de la temperatura global en 1601 asociado a esta erupción. Esta disminución de la temperatura fue una de las cinco mayores generadas por...

173 páginas