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Data Processing: Stacking Seismic traces from the same reflecting point are gathered together (CRP gather) and summed, or 'stacked'.
The six seismic traces on the left are from the same reflecting point. As the traces are merged into one (right), background noise cancels itself out while the seismic signals add together, producing a stronger signal-to-noise ratio. (The output trace on the right is shown here six times only to provide a better comparison). The more of these seismic traces we can stack together into one output trace, the clearer the seismic image.
Data Processing: Stacking (2)
This first image shows a seismic section produced after the seismic traces have been sorted, adjusted for varying path lengths and signal strength, and stacked.
Here, each trace is the summation of 48 individual 'shot' traces.
Note the water bottom 'multiple' reflection (arrowed) -- a seismic 'echo' of the seafloor caused by energy bouncing back-and-forth within the water layer to produce a 'false' reflection obscuring the real data.
The six seismic traces on the left are from the same reflecting point. As the traces are merged into one (right), background noise cancels itself out while the seismic signals add together, producing a stronger signal-to-noise ratio. (The output trace on the right is shown here six times only to provide a better comparison). The more of these seismic traces we can stack together into one output trace, the clearer the seismic image.
Data Processing: Stacking (2)This first image shows a seismic section produced after the seismic traces have been sorted, adjusted for varying path lengths and signal strength, and stacked.
Here, each trace is the summation of 48 individual 'shot' traces.
Note the water bottom 'multiple' reflection (arrowed) -- a seismic 'echo' of the seafloor caused by energy bouncing back-and-forth within the water layer to produce a 'false' reflection obscuring the real data.
