Iterative gravity migration

Note that we can give the same physical interpretation to every subsequent iteration in the iterative scheme (7.26). According to formulae (7.12) and (7.43), the direction of the steepest ascent I (p ) on each iteration can be computed using migration of the residual field (Q — gr (C)], which is the difference between the predicted field on the n-th iteration, g , and the observed gravity field gr  

Multiplying dfi by the inw rse weighting function, wo finally find the cori e-sponding density stCf)  

Integral representations in inversion of gravity eind magnetic data 

In the later sections of this book we will demonstrate that the same technique can be applied to electromagnetic and seismic wave field Inversion. In these areas of geophysics, migration serves as a useful practical tool for imaging geophysical data, because of the relative numerical simplicity and transparent physical interpretation of the results of electromagnetic and seismic migration. 

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Using gravity migration, we can find the first iteration for the density of the gravity... 

Thus, as in the gravity case, the calculation of the each iteration in the conjugate gradient method for magnetic potential inversion can be based on the migration transformation. 

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