Pre? and Co?Eruptive Analysis of the September 2021 Eruption at Cumbre Vieja Volcano (La Palma, Canary Islands) Through DInSAR Measurements and Analytical Modeling

We investigate the 19 September 2021 eruption of Cumbre Vieja volcano (La Palma, Canary Islands, Spain). In particular, we analyze Differential Interferometric Synthetic Aperture Radar (DInSAR) measurements obtained by processing Sentinel-1 images acquired from both ascending and descending orbits. First, show importance, for oceanic islands like La investigating DInSAR products retrieved time series, instead single interferograms, to effectively remove possible atmospheric artifacts within displacement measurements. Subsequently, invert data through analytical modeling. Our results highlight that a sill–like source was active in pre–eruptive phase (8–16 September), whereas action two dikes prevailed during co-eruptive (17–22 September). This evolution suggests process magma rising network interconnected sills dikes. The seismicity, preceded accompanied onset eruption, is consistent with our findings.