Kirchhoff Prestack Time Imaging (PreSTM)
Kirchhoff prestack time migration is typically applied after the input data has
True amplitude Kirchhoff prestack time migration, Yu Zhang’s weighting function (2000) is used to handle the true amplitude weight. It includes compensation for the geometrical spreading in Bjorn Ursin (1990), and the “directional illumination” (
For antialiasing, each input trace is low-pass filtered with a predetermined set of filters to form a number of frequency bands. A maximum
Beylkin, G. and R. Burridge, 1990, Linearized Inverse Scattering Problems in Acoustics and Elasticity, Wave Motion, 12 (1), 15-52.
Ursin, B., 1990, Offset‐dependent geometrical spreading in a layered medium: GEOPHYSICS, 55(4), 492-496.
Zhang, Y., S. Gray, and J. Young, 2000, Exact and approximate weights for Kirchhoff migration: 70th Annual International Meeting, SEG, Expanded Abstracts.