Abstract
Compressional wave attenuation in the frequency range 50 to 350 Hz is estimated using broadband data collected in the East China Sea. A time-frequency analysis provides amplitudes of individual modes which are used to estimate the modal attenuation coefficients. Different modes are sensitive to sediment properties at different depths and this mode-depth sensitivity is explored in a sensitivity study. Based on this sensitivity study attenuation in different layers of the sediments will be estimated using different modes which are sensitive at these depths. This is a variation of previous studies where different frequencies have been used to invert for different sediment parameters using sub-space approaches. This approach focuses the inversion to various layers (provided by the geophysical surveys at the site) of the sediment and hence presents a tool to describe the depth variations in the sediment. The attenuation versus frequency behavior of the different sediment layers will be discussed. [Work supported by ONR.]
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