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《Journal of Harbin Engineering University》 2010-07
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Propagation of seismic waves caused by underwater infrasound

ZHANG Hai-gang,PIAO Sheng-chun,YANG Shi-e(Acoustic Science and Technology Laboratory,Harbin Engineering University,Harbin 150001,China)  
At present,theoretical analysis of the bottom seismic wave have been limited to dealing with a horizontal layered elastic bottom.A more detailed understanding would allow more accurate modeling of the interactions of seismic waves with the ocean bottom.The mechanisms promoting seismic wave propagation in shallow water were studied.With an elastic ocean bottom and a shear wave larger than the speed of sound it was found that all four cases,the normal modes in water and the Scholte waves in water,as well as the sub-interface waves and the Scholte waves were excited by low frequency sources in shallow water.An elastic parabolic approximation method for calculating seismic waves was developed.A field distribution rule for seismic waves was also analyzed.In wedge shaped basins with an elastic bottom,the energy of the normal modes in water as well as that of sub-interface waves will experience leakage as water depth decreased.
【Fund】: 国家自然科学基金资助项目(50979019)
【CateGory Index】: O427.1
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