Abstract
The paper investigates on the hydro-acoustic waves propagation caused by the underwater earthquake, occurred on 6 February 2012, between the Negros and Cebu islands, in the Philippines. Hydro-acoustic waves are pressure waves that propagate at the sound celerity in water. These waves can be triggered by the sudden vertical sea-bed movement, due to underwater earthquakes. The results of three dimensional numerical simulations, which solve the wave equation in a weakly compressible sea water domain are presented. The hydro-acoustic signal is compared to an underwater acoustic signal recorded during the event by a scuba diver, who was about 12 km far from the earthquake epicenter.
Highlights
In many applications the sea water is correctly assumed to be incompressible, its weakly compressibility cannot be neglected when studying some specific phenomena
The paper investigates on the hydro-acoustic waves propagation caused by the underwater earthquake, occurred on 6 February 2012, between the Negros and Cebu islands, in the Philippines
Hydro-acoustic waves are pressure waves that propagate at the sound celerity in water
Summary
In many applications the sea water is correctly assumed to be incompressible, its weakly compressibility cannot be neglected when studying some specific phenomena. The second, named hydro-acoustic waves, propagate at the sound celerity in water, approximately 1500 m/s and their period is the time interval needed to propagate from the bottom to the free-surface four times. Given that their propagation speed is significantly larger than that of the tsunamis, hydro-acoustic waves are tsunami precursors. The recorded audio revealed a specific spectral signature few seconds after the earthquake, that has been attributed to hydro-acoustic waves by comparison with results of two dimensional numerical simulation.
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