Abstract
A total of six experiments using a drifting vertical array have been carried out between 2002 and 2004. The purpose was to investigate the bottom reflection properties by inversion of ambient noise (GAIN=GeoAcoustic Inversion of Noise) and to investigate subbottom layering (SUPRA-GAIN=SUb-bottom PRofiling using Ambient noise) at frequencies from a few hundred Hz to 5000 Hz. Areas covered include the fairly flat, layered sediments of the Malta Plateau and the rocky outcrops of the Ragusa Ridge in the Mediterranean south of Sicily. Interesting comparisons can be made with other surveying techniques such as the boomer and chirp sonar. Fourier theory states that the depth limit for such subbottom profiling is set by the frequency resolution of the deduced reflection loss. There are other factors that degrade the deeper returns and some pragmatic limitations have been established. Comparisons of results with models suggest that as far as acoustic reflection properties are concerned, in rocky localities the roughness of the rock is more important than the shear.
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