The Estimation of the Density, P-Wave, and S-Wave Speeds of the Top-Most Layer of Sediments, from Water Bottom Reflection Arrivals
Procedures for estimating material properties of the sea floor sediments are presented. The estimation procedures make use of the relationship between amplitude and offset for pre-critical reflections, and the relationship between phase shift and offset for post-critical reflections. In all cases we assume that the source, hydrophone, and ocean depths are given, and that the measured bottom reflection is adequately modelled as a plane wave response. We consider three cases: the sea floor sediments are approximated as a liquid layer, and the relation between reflection strength and source-receiver offset for a set of pre-critical reflections is analysed; the sea floor sediments are approximated as a liquid layer, and the relation between phase shift and source-receiver offset for a set of post-critical reflections is studied; the sediments layer is assumed to be elastic, and the relation between reflection strength and source-receiver offset for a set of pre-critical reflections is analysed.
KeywordsWater Bottom Elastic Medium Synthetic Seismogram Direct Arrival Reflection Amplitude
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