Inverted shear-wave velocity model of shallow-water marine sediments (Gulf Coast Offshore Monitoring Study, 2025)

This data set was generated as part of the Texas Consortium for Computational Seismology Gulf Coast Offshore Monitoring Study that uses 65 km of shallow-water telecommunications distributed acoustic sensing (DAS). This data set presents a seismic shear-wave velocity model that extends horizontally from the shore to 51 km offshore across the Texas shelf and vertically from the near-seafloor to approximately 2.7 km depth, with broad shallow low-velocity intervals interpreted as softer incised-valley fill within stiffer Pleistocene deposits. The velocity model is in GMT-compatible netCDF grid format. The study area polygon is included as "study_area_polygon" and represents a generalized study-area outline sufficient to place the model geographically. The distance coordinate is profile distance in m (grid interval 127.6 m), the depth coordinate is depth in m below seafloor (variable grid interval), and the values of the shear-wave velocities are in m/s. The passive seismic data used for Scholte-wave imaging and shear-wave velocity inversion were acquired using a stationary seabed telecommunications fiber-optic cable that begins onshore near the modern Brazos River delta and extends seaward into the deeper Gulf basin. The data set analyzed for this model spans one day, October 1, 2025. DAS acquisition used a gauge length of 23.93 m and a channel spacing of 12.76 m, providing 5,091 channels along approximately 65 km of cable.