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Authors: Chierici, F.* 
Pignagnoli, L.* 
Embriaco, D.* 
Title: Modelling of the hydro-acoustic signal and tsunami wave generated by sea floor motion including a porous seabed
Issue Date: Oct-2009
Series/Report no.: / (2009)
DOI: 10.1029/2009JC005522
Keywords: tsunami generation
seafloor motion
Subject Classification05. General::05.06. Methods::05.06.99. General or miscellaneous 
Abstract: Within the framework of a 2-D compressible tsunami generation model with a flat porous seabed, acoustic waves are generated and travel outwards from the source area. The effects of the porous seabed during tsunami generation and propagation processes include wave amplitude attenuation and low pass filtering of both the hydro-acoustic signal and tsunami wave. The period of the acoustic wave generated by the seafloor motion depends on water depth over the source area and is given by four times the period of time required for sound to travel from the sea bed to the surface: these waves carry information about seafloor motion. The semi-analytical solution of the 2-D compressible water layer model overlying a porous seabed is presented and discussed. Furthermore, to include the effects generated by the coupling between compressible porous sedimentary and water layers, a simplified two layer model with the sediment modelled as a compressible viscous fluid is presented.
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