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According to Claerbout's (1971) imaging principle, a reflector exists where the source and the receiver wavefields coincide in time and space.
Claerbout expresses the imaging condition as follows:
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(1) |

where *x* is the horizontal coordinate, *z* is the depth, and *t*_{d} is the time at which the source wavefield and the receiver wavefield coincide in time and space. This principle states that the reflectivity strength depends only on the source and the receiver wavefields at time *t*_{d}.
The time *t*_{d} is not known a priori, therefore we need a practical way to locate the reflector position in the (*x*,*z*) plane and compute its strength.

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Stanford Exploration Project

7/8/2003