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apparent abnormal Alluvial

In seismic data, the relationship between the speed determined from a "normal moveout" (ie, first measure horizontal) to the measured velocity in a vertical seismic profile vertical or in a survey similar.La apparent anisotropy is particularly important when migrating long offset seismic data analysis and AVO accurately. normal moveout velocity implies the horizontal component of the velocity field, which affects the source and receiver offset, but the horizontal velocity field is not involved in the calculations of vertical velocity measured depth pairs time.

From: 20anisotropy http://www.glossary.oilfield.slb.com/Display.cfm?Term=apparent%