STUDY ON THE RANGE OF MULTIPLE REFLECTED REFRIACTION WAVE STRIPS IN SHALLOW WATER ENVIRONMENT

On shallow-water seismic profiles, there is always a "broom-like" band above the direct wave. The determination of wave composition of the band is helpful to the understanding of seismic wave propagation, which will provide a reference basis for establishing an appropriate observation system for offshore operation and data processing. Based on the analysis of wave propagation path of multiple reflection of refraction waves on land, by analysis of the numerical simulation results of a simple model, it is concluded that the "broom-like" band above the direct wave in the shallow water environment is the overall reflection of the refracted wave generated by some kinds of subsurface medium. In addition, quantitative analysis of the scope of the "broom-like" band of the multi-reflected refraction waves and studies of their influencing factors are carried out and verified with actual seismic data.