Translations:Velocity analysis - book/3/en

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Seismic waves travel with medium-dependent velocities. The assumption that the velocity is the same for two forms of the same type of rock, such as two sandstone formations, generally is not valid. Seismic velocity in different kinds of sandstone can vary over a wide range. Each new rock layer traversed by the seismic wave has its own characteristic velocity. The challenge for the geophysicist is to determine those velocities. Generally, velocity increases with depth, although occasionally, layers can exist in which a decrease in velocity (or a velocity reversal) occurs.