Fictitious seismic anomalies sometimes result from the use of inadequate techniques in making the surface corrections. The effect of topography on the velocities of the underlying layers, commonly referred to as load effect, is a factor which is generally neglected in routine seismic interpretation. The importance of analyzing the load factor is illustrated by an actual example in which a fairly attractive seismic anomaly is shown to be entirely due to velocity variations associated with surface topography. A method of correcting for load effect is discussed.

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