Some Experiments in the Suppression of Coherent Noise on Land 3-D Seismic shot Records

Abstract

In conventional land seismic reflection surveys, a source is triggered at or near to the surface of the earth. Vibrations from the source are reflected from the subsurface, and these are recorded by geophones or. groups of geophones normally placed in a line. Traces recorded by each group make up a shot record and comprise subcritical reflections or data, and linear noise trains such as refractions and high amplitude source generated noise commonly called ground roll (Fig. 1). This ground roll travels within the near-surface low velocity layer, and as such cuts across and obscures the flatter reflection events which have a higher apparent horizontal velocity in a shot record.