A workflow for Complex Multi-Source Tsunami Modelling

The 2022 Hunga Tonga–Hunga Ha'apai (HTHH) eruption and tsunami demonstrated the need to be better able to model tsunamis generated via multiple source mechanisms and with impact at scales from local, to regional, and global. There have however been many other examples of complex geophysical events that generate tsunamis either by a multiplicity of sources or cascades of events: e.g. the 2018 Palu event, the Aysen fjord tsunamis in 2008, the Flores Island tsunami in 1992, and the 1964 Prince Willams Sound tsunami. High Performance Computing (HPC) is necessary to be able to provide the necessary temporal and spatial resolution needed for modelling the multiple physics sources and tsunami propagation and inundation for events such as HTHH. Within the ChEESE-2P project funded by EuroHPC, a workflow is presently being developed to simulate the impact of complex tsunamigenic events in both near and far fields leveraging HPC resources. A set of numerical models optimized for HPC are coupled within the workflow: SeisSol (for modelling earthquake sources, tsunamigenesis, and acoustic coupling), ExaHyPE (for modelling gravitational flows and water wave propagation), MultiLayer-HySEA (for modelling near-field tsunami generation), Meteo-HySEA (for modelling tsunami generation driven by atmospheric waves), and Tsunami-HySEA (for modelling regional and global tsunami propagation and inundation). In this presentation, we outline the workflow, including the individual application modelling components, their coupling, and the plan to couple the models together for a joint future simulation for the HTHH event using the workflow.