Numerical modeling of the wave field in seismic profiling of the seafloor

The seismoacoustic field produced by an omnidirectional sound source located near the bottom of a shallow-water sea is numerically modeled at frequencies lower than 100 Hz. The main types of waves that are excited and scattered in the fluid and the layered bottom medium are represented in the form of wave hodographs on the distance-arrival time plane. A possibility to solve some problems of acoustic tomography of the bottom is demonstrated, in particular, the problem of determining the thickness of the bottom sediment layers and the velocities of the longitudinal and transverse waves propagating in them. By varying the elastic parameters of the layered bottom model, typical changes in the wave field are analyzed and the possibility to predict the presence of oil-saturated layers in the seafloor is established.