Shear properties of ocean sediments determined from numerical modelling of Scholte wave data
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Abstract
Recently it has become apparent that shear properties of ocean sediments are most easily determined from measured propagation characteristics of seismic interface waves. We use a newly developed numeri ca l model of wave propagation in horizontally stratified viscoelastic media to reconstruct from Scholte-wave records the shear-speed and shearattenuation profiles in the upper sediment layers of a shallow-water test area. For an unconsolidated sand-silt bottom we find the shear speed to increase with depth from 85 mls at the sea floor to 300 ml s a t 60 m depth. On the other hand, the shear attenuation at 3 Hz decreases with depth from 0.45 dB/A at the sea floor to 0.15 dB/A at 60 m depth, with an approximately quadratic frequency dependence.
Report Number
CP-37Source
In: Selected papers on ocean-seismo acoustics low-frequency underwater acoustics (SACLANTCEN Conference Proceedings CP-37), 1986, pp. 5-1 - 5-10.Date
1986/06Author(s)
Jensen, Finn B.
; Schmidt, Henrik