Field and Synthetic Waveform Tests on Using Large‐Offset Seismic Streamer Data to Derive Shallow Seabed Shear‐Wave Velocity and Geotechnical Properties

Abstract Characterizing properties of marine subsurface sediment helps with siting for offshore infrastructure. Shear‐wave velocity ( V s ) provides information on the geotechnical seabed. We present our initial efforts to obtain a detailed two‐dimensional model large‐offset multi‐channel seismic (MCS) transect collected in shallow waters across Taiwan Strait using surface waves excited by large volume airgun. derived dispersion curves Scholte along 37.5‐km‐long phase‐shift method and then conducted multimodal inversion down depth 150 m. To estimate dynamic Poisson's ratio transect, we combined compressional wave from traditional MCS semblance analysis. Lastly, approximated attenuation profile. Our results show lateral variation shear‐wave velocity. In north, low‐velocity zone velocities about m/s was identified, while south, found be 300 m/s. With synthetic data, several sensitivity tests were performed derive optimal parameters streamer data. particularly focused source water combination different seabed properties. that can robustly velocity, ratio, data elsewhere based criteria have tested field sets.