Abstract
This paper presents estimates of shear-wave velocity profiles for different types of sediments by inverting the dispersion curves of interface waves. Data used in this study were collected at different locations with different recording devices in different experiments. Four data sets were analyzed. Data from one set were recorded by hydrophone array, and data from other three sets were collected by multi-component ocean bottom seismic cables. The configuration of the experimental setup and the environmental conditions were different for the different experiments. Water depth varied from 2 m to 365 m. The frequency range of the interface-wave data was from 1.5 Hz to around 20 Hz. The phase-velocity dispersion curves of the interface waves were extracted using different time-frequency analysis methods. The maximum penetration depth of the interface waves to the sediments varied from 15m to 180 m. A Bayesian nonlinear inversion approach was used for estimating shear-wave velocity profiles as a function of depth in the sediments and the uncertainties. The estimated shear-wave velocity profiles from different experiment and different sediment type were discussed and compared.
Published Version
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