The weighted modified diffraction stack operator provides the necessary correction to remove the geometrical spreading<br>in the compressional primary reflection wavefield. This is reached by applying a proper weight function to the input data<br>during the migration process. The theoretical development is based on describing the seismic wavefield by the ray<br>asymptotic zero-order approximation and using a Kirchhoff type migration operator. In this paper we present a trueamplitude<br>migration algorithm that is able to be applied to two-and-one-half (2.5-D) seismic data. Through example of<br>application to a set of synthetic seismic data with noise enviroment, it is possible to confirm the high efficiency of the<br>algorithm for obtaining the reflection coefficient, which is of great interest for the amplitude versus offset (angle) analysis.


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