Translations:Geometric seismology/8/en

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Another type of inhomogeneity exists with which we often will be concerned. The rocks might be isotropic everywhere, yet the absolute velocity can vary from place to place. Normally, the velocity in sedimentary rocks increases with depth. This is called vertical velocity variation. The velocity also can change horizontally, in which case we have horizontal, or lateral, velocity variation. When such variations are encountered, methods must be devised to take them into account properly.