Changes

[[Basic seismic processing#Demultiple|Multiple interference]] can render amplitude with offset analysis of the CDP gathers meaningless. Generally, multiples are more dominant in data from the marine environment, but can also be strong in land data. Multiples are usually not visually evident in land data because of trace spacing and lower fold and will appear as strong random noise. But proper use of multiple removing programs, such as [[radon transform method]]s, can yield excellent results.

[[Basic seismic processing#Demultiple|Multiple interference]] can render amplitude with offset analysis of the CDP gathers meaningless. Generally, multiples are more dominant in data from the marine environment, but can also be strong in land data. Multiples are usually not visually evident in land data because of trace spacing and lower fold and will appear as strong random noise. But proper use of multiple removing programs, such as [[radon transform method]]s, can yield excellent results.

[[:file:amplitude-versus-offset-avo-analysis_fig4.png|Figure 4]] shows NMO-corrected CDP gathers that have been processed with the proper amplitude corrections and cascaded noise reduction methods. It is critical that noise be removed without smearing the signal or introducing artifacts, which often occurs with multichannel filtering techniques.

[[:file:amplitude-versus-offset-avo-analysis_fig4.png|Figure 4]] shows NMO-corrected CDP gathers that have been processed with the proper amplitude corrections and cascaded noise reduction methods. It is critical that noise be removed without smearing the signal or introducing [[artifact]]s, which often occurs with multichannel filtering techniques.

==AVO scanning==

==AVO scanning==