The hybrid ray-reflectivity method is applied to the numerical modelling of seismic wave fields in laterally varying layered models containing a thin near-surface low-velocity layer. The computations within the laterally varying layered model are performed by the ray method, but the thin near-surface layer is attacked locally by the matrix methods. The thin layer need not be homogeneous, it may include arbitrary inner layering and it may vary slightly laterally. All multiples within the layer are automatically taken into account. Numerical examples of hybrid ray-reflectivity seismograms for two models of the thin near-surface layer are presented. An inverse algorithm to remove the effects of a thin near-surface layer from seismograms recorded at the earth's surface is proposed.
Seismic waves, ray method, hybrid-ray reflectivity method, near-surface structure, multiple suppression
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