P023 Multiple Subtraction According to Orders S. Huo* (Imperial College London) & Y. Wang (Imperial College London) SUMMARY The results of multiple attenuation strongly depend upon the adaptive subtraction in which the matched filter length the time window size and the number of channels are three essential parameters to get the best result. We will show in this paper that the application of EMCM (expanded multi-channel matching) with long time window and short filter length can normally give the best results. The multiple energy can be attenuated thoroughly and the primary energy well preserved at the same time. Within a


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