Kirchhoff prestack migration and modelling are linear operators. Therefore, it is possible to apply them to the earth model and seismic data as a matrix-vector multiplication instead of using an operator. A visual technique for creating Kirchhoff modelling, G, migration, G T , and inversion, G T G,matrices is shown without requirement of going to the deep mathematics of Kirchhoff migration or Green functions. Construction of the modelling/migration matrices goes to the most internal loop of the Kirchhoff modelling/migration algorithms. Once they are calculated, they can be easily repeated just by multiplication of the matrix to the model or data vector.
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