Translations:Seismic tomography - book/10/en

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What is reflection tomography? Reflection tomography involves two-way transmission. The seismic waves from a surface source propagate to an interface from which they are reflected. Then the waves propagate back to receivers on a convenient recording surface. Because of the problem of defining the reflector position, reflection tomography is more difficult to apply than transmission tomography is. In reflection tomography, the ray-traced traveltimes of the model are matched to the picked traveltimes. The result of this iterative-improvement method is an estimate of the interval velocities. Such velocity estimates are required to produce reliable images with seismic migration methods. In this sense, tomography and migration are complementary processes.