Seabed, peg-leg, and long-range multiples were simul ated and computed i nteractively on workstation by ray tracing scheme. The authors conduct tests on the geologic models in southern Pearl River Mouth Basin, South China Sea, an are a with serious multiples. Through the constrast between real shot records and ze ro-offset records, it can be judged that the reflections in the deep part of th e surveying area are not multiples, but effective waves.
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