Coherent noise attenuation is an ever-evolving technology, and radial trace domain filtering algorithms continue to change and advance, as well. Our previous version of the ProMAX radial filtering module provides several ways in which to attenuate coherent noise, including the recommended one of estimating coherent noise with a low-pass filter in the radial trace domain, then subtracting the noise estimate from the original trace gather in the X-T domain. We now have a new option in which the X-T noise subtraction is done by a least- squares subtraction algorithm. We demonstrate here that the new method provides significantly better noise attenuation, both with single filter applications and with sets of cascaded filters.
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