Abstract
The paper presents results of geoacoustic inversions obtained using a direct inversion scheme based on the calculation of the reflection coefficient of a stratified elastic bottom. The reflection coefficient has been derived from measurements of the acoustic field at a vertical line array of hydrophones moored in the area of the Haro Strait, during the PRIMER sea trial that was carried out in June 1996. Light bulbs have been used as acoustic sources with peak power around 600 Hz. Inversions for the sound speed, the density, and the shear speed of a sediment layer and a semi-infinite substrate and the thickness of the sediment have been performed by separating the various echoes at the receiver and identifying their type through a multiple stage optimization procedure. The results are compared with matched field inversions and a good agreement is demonstrated especially for the parameters of the sediment layer. The applicability of the new method for different experiment setups is also discussed.
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