True-amplitude migration based on a weighted diffraction stack is a task of high computational costs. These can be significantly reduced if the involved summation is carried out only over traces which really contribute to the stack result, i.e., a limited aperture instead of the whole aperture of the experiment. We introduce a technique to determine an optimum migration aperture that needs only traveltime tables as input information. These are also used for the 'on the fly computation' of the true-amplitude weight functions and for an efficient and highly accurate traveltime interpolation. The new strategy leads to considerable savings in computational time and storage. A synthetic example illustrates the method.
True amplitude migration based on a weighted diffraction stack is a task of high computational costs. These can be significantly reduced if the involved summation is carried out only over traces which really contribute to the stack result, i.e., a limited aperture instead of the whole aperture of the experiment. We introduce a technique to determine an optimum migration aperture that needs only travel time tables as input information. These are also used for the on the fly computation of the true ampitude weight functions and for an efficient and highly accurate traveltime interpolation. This leads to considerable savings in computational time and storage. A synthetic example demonstrates the method.