Ocean waveguide effects on acoustic and seismic ULF propagation

Underwater wave propagation in the domain of ultra low frequencies (ULF, between 1 and 50 Hz) is highly dependent on the seabed. Three types of wave propagation are observed according to the environment and experiment configuration. After a description of these three types of wave propagation and a presentation of the means and techniques deployed, this paper deals with an illustration of these various situations from data which are issued from two different campaigns (Prosisma-GL1 and Rinalig). Particular attention is focused on the ocean waveguide effects in this ULF frequency band. The authors conclude that the main ocean waveguide effect is due to the sedimentary layers