Synthetic data example

The synthetic example is inspired by () and shows clearly that the hybrid method is more accurate than the standard approach.

In Figure a, the signal, I show a linear event with a gradient of 1.05 from trace to trace. Figure b, the noise, displays another linear event with constant amplitude that perfectly overlaps with Figure a. The sum of Figures a and b gives Figure c, the data.

To make matters worse, I applied a phase-shift to the noise in order to compute the noise model (Figure d). My goal is to adaptively subtract this noise model from the data in Figure c in order to retrieve the signal in Figure a.

 

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Figure 1 (a) A linear event, the signal, with a gradient of 1.05. (b) A linear event, the noise, with constant amplitude. (c) The sum of (a)+(b), the data. (d) A noise model obtained after applying a phase-shift to (b).

Now I estimate the filter with the standard approach and compute the signal in Figure b. The estimated signal clearly does not resemble the true signal in Figure a.

The hybrid method gives a perfect result. First I estimate a pef with two coefficients for the signal by deconvolving the data pef by the noise pef. I obtain for the signal pef 340#340.Then I estimate the matched-filter with the hybrid approach and compute the signal in Figure c. The separation is perfect as shown in the difference panel in Figure d.

 

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Figure 2 (a) The signal. (b) Estimated signal with the standard approach. (c) Estimated signal with the hybrid approach. (d) Difference between (a) and (c). The noise removal is perfect.

In the next section I show prestack land data examples.