General Seminar : Dr. Hélène Le Mével
Abstract: On January 15, 2022, the largest explosive eruption instrumentally recorded occurred at Hunga Tonga-Hunga Ha’apai volcano in the Tonga-Kermadec island arc. In this talk, I will first summarize the 2022 eruptive sequence and the multidisciplinary observations that made this eruption exceptional. I will then show how we can use gravity data derived from satellite altimetry to determine the architecture of the magmatic system. Multibeam bathymetry data acquired post-eruption reveal the seafloor changes associated with the eruption including the dramatic ~850m caldera collapse. We will see how the eruption and associated caldera collapse reorganized magma storage under Hunga Tonga volcano.
photo of a volcano from from 2012 from DTM archives found on the CAVE
Abstract:
On January 15, 2022, the largest explosive eruption instrumentally recorded occurred at Hunga Tonga-Hunga Ha’apai volcano in the Tonga-Kermadec island arc. In this talk, I will first summarize the 2022 eruptive sequence and the multidisciplinary observations that made this eruption exceptional. I will then show how we can use gravity data derived from satellite altimetry to determine the architecture of the magmatic system. Multibeam bathymetry data acquired post-eruption reveal the seafloor changes associated with the eruption including the dramatic ~850m caldera collapse. We will see how the eruption and associated caldera collapse reorganized magma storage under Hunga Tonga volcano.