The first step of migration consists of downward continuation of the wavefield measured at the surface (a.k.a. the data), which is done by the recursive application of the equation
u0z+1 = T0z u0z | (1) |
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(2) |
The second step of the migration by downward continuation is imaging.
According to the exploding reflector concept, the image is found by
selecting the wavefield at time t=0, or equivalently, by summing
over the frequencies :
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(3) |