EGU General Assembly 2020
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Ground deformation associated with the August 2019 eruption of Piton de la Fournaise (La Réunion Island) inferred from DInSAR measurements

Vincenzo De Novellis1, Francesco Casu1, Claudio De Luca1, Mariarosaria Manzo1, Fernando Monterroso1,2, Emanuela Valerio1, Riccardo Lanari1, and Maurizio Battaglia3
Vincenzo De Novellis et al.
  • 1IREA - National Research Council (CNR), Engineering - ICT and Technology for Energy and Transport, Napoli, Italy (
  • 2Università degli Studi di Napoli Parthenope, Centro Direzionale (Isola C4), 80133 Napoli, Italy
  • 3Department of Earth Sciences, Sapienza University of Rome, 00185 Rome, Italy

Piton de la Fournaise volcano forms the southeastern part of La Réunion, an oceanic basaltic island in the southernmost part of Mascarene Basin (Indian Ocean). Five eruptions occurred at Piton in 2019, accompanied by seismic activity, lava flow, and lava fountaining. Here below, we focus on the fourth eruption occurred between August 11 and 15 on the southern-southeastern flank of the volcano, inside the Enclos Fouqué caldera. This eruption was characterized by the opening of two eruptive fissures. We retrieve the surface deformations induced by the eruptive activity through space-borne Differential Synthetic Aperture Radar Interferometry (DInSAR) measurements. First, we generated the coseismic deformation maps by applying the DInSAR technique to SAR data collected along ascending and descending orbits by the Sentinel-1 constellation of the European Copernicus Programme. The DInSAR technique allows us to analyze the deformation patterns caused by the 11 August 2019 eruption. We also retrieved the pre-eruptive deformation through the Small BAseline Subset (SBAS) DInSAR approach. Then, we modelled the DInSAR displacements to constrain the geometry and characteristics of the eruptive source. The modelling results suggest that the observed deformation can be attributed to the interaction between a shallow magma reservoir located at ~1.5-2 km depth below the summit, and the intrusion of a dike feeding the eruptive fissure inside the Enclos Fouqué caldera.

This work is supported by: the 2019-2021 IREA-CNR and Italian Civil Protection Department agreement; the EPOS-SP project (GA 871121); and the I-AMICA (PONa3_00363) project.

How to cite: De Novellis, V., Casu, F., De Luca, C., Manzo, M., Monterroso, F., Valerio, E., Lanari, R., and Battaglia, M.: Ground deformation associated with the August 2019 eruption of Piton de la Fournaise (La Réunion Island) inferred from DInSAR measurements, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-18664,, 2020.