PSInSAR as a new tool to monitor pre‐eruptive volcano ground deformation: Validation using GPS measurements on Piton de la Fournaise

A novel application of Permanent Scatterers Synthetic Aperture Radar Interferometry (PSInSAR™) demonstrates its potential as a highly precise tool for monitoring ground deformation in volcanic areas, particularly at Piton de la Fournaise. The study reveals two distinct zones of deformation: subsidence on the eastern flank due to old lava flows and significant activity at the summit cone, often preceding eruptions. PSInSAR-derived velocities align closely with continuous GPS (cGPS) measurements, capturing both long-term ground displacements (0.05–0.35 m/year) weeks or months before eruptions and rapid, large-scale movements during eruptive events. Despite challenges like signal loss during rapid deformation, the technique offers reliable, large-area monitoring of volcanic activity, as validated by this ESA Globvolcano project research.

Peltier, A., Bianchi, M., Kaminski, E., Komorowski, J.-C., Rucci, A., & Staudacher, T. (2010). PSInSAR as a new tool to monitor pre‐eruptive volcano ground deformation: Validation using GPS measurements on Piton de la Fournaise. Geophysical Research Letters, 37(12). Portico. https://doi.org/10.1029/2010gl043846