5-5-5-5-5-5-5-5-5-5-5-5-5-5 From: "Raphaël PARIS" <raphael.paris@xxxxxx> The University Clermont-Auvergne opens a 3 years fully-funded PhD project on â??Tsunamis generated by eruptive column collapse: an experimental approachâ?? at the Laboratoire Magmas & Volcans, France. Summary : Explosive volcanic eruptions generate ascending columns of pyroclastic material that collapse if they become denser than the atmosphere. In the case of an underwater eruption at shallow depth or on a small island, column collapse becomes a potential cause of tsunami. This tsunamigenic mechanism could have been involved in eruptions such as Krakatau in 1883 (Indonesia) and Hunga Tonga â?? Hunga Ha'apai in 2022 (Tonga). The objective of the thesis is to carry out experiments in a tsunami channel in order to understand the physical mechanisms that govern the generation of tsunami through collapse of an eruptive column and the vertical entry of pyroclastic material into the water. The collapse of the eruptive column is simulated by the free fall of a granular material released from a reservoir located in the middle of the channel and at various heights. The experiments are filmed by two high-speed video cameras, one centered on the impact zone, the other placed downstream to record the propagation of the wave in the channel. The results of the laboratory experiments will also provide benchmarking for numerical models of complex sources of tsunamis such as eruptive column collapses, and to integrate such scenarios in tsunami warning systems. Contact: PhD supervisors : Raphaël Paris, Olivier Roche Laboratoire Magmas et Volcans Université Clermont-Auvergne, France raphael.paris@xxxxxx (tel. +334 73 34 67 17) 5-5-5-5-5-5-5-5-5-5-5-5-5-5 ------------------------------
