Large-scale numerical modeling of hydro-acoustic waves generated by tsunamigenic earthquakes
- 1Roma Tre University, Engineering Department, Via Vito Volterra 62, 00146 Rome, Italy
- 2Department of Civil and Environmental Engineering, Center for Applied Coastal Research, University of Delaware, Newark, Delaware, USA
- 3University of Rome Tor Vergata, Civil Engineering Department, Via del Politecnico 1, 00133 Rome, Italy
Abstract. Tsunamigenic fast movements of the seabed generate pressure waves in weakly compressible seawater, namely hydro-acoustic waves, which travel at the sound celerity in water (about 1500 m s−1). These waves travel much faster than the counterpart long free-surface gravity waves and contain significant information on the source. Measurement of hydro-acoustic waves can therefore anticipate the tsunami arrival and significantly improve the capability of tsunami early warning systems. In this paper a novel numerical model for reproduction of hydro-acoustic waves is applied to analyze the generation and propagation in real bathymetry of these pressure perturbations for two historical catastrophic earthquake scenarios in Mediterranean Sea. The model is based on the solution of a depth-integrated equation, and therefore results are computationally efficient in reconstructing the hydro-acoustic waves propagation scenarios.