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Authors: Chierici, F.* 
Pignagnoli, L.* 
Embriaco, D.* 
Title: Modelling of the hydro-acoustic signal as a Tsunami Precursor
Issue Date: 2008
Keywords: tsunami generation
seafloor motion
Subject Classification05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous 
Abstract: In the frame of a 2-D compressible tsunami generation model with flat porous seabed, we show that acoustic waves are generated and travel outside the source area at sound speed. These waves carry information as to sea floor motion. The acoustic wave period depends on water height at the source area and is given by four times the travel time the sound takes to reach the sea surface from the sea bottom. The fundamental frequency ranges from 1 to 0.05 Hz, at 400 m and 8000 m water depth, respectively. The sound waves produced by seafloor motion can propagate far from the source, with a small attenuation in amplitude. Moreover, the typical wavelengths of the acoustic waves produced by the water layer oscillation allows the waves to overcome most of the seafloor reliefs. The semi-analytical solution of the 2-D compressible water layer model overlying a porous seabed is presented
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