Energy that does not correlate between distinct receiving channels; energy which is random with respect to the source parameters. By adding together n elements, random noise can be attenuated with respect to coherent signal by the factor n1/2. Random seismic noise is attenuated by the use of many geophones per group or by stacking traces. In contrast to coherent noise such as unwanted modes of wave travel like ground roll, air wave, etc. The distinction between random and coherent is often a matter of scale.