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The authors gratefully acknowledge Sergey B. Fomel for his suggestions and help. We thank Douglas W. McCowan for fruitful discussions. We sincerely thank assistant editor Vladimir Grechka, associate editor Eric Verschuur, and three anonymous reviewers for their constructive comments and suggestions. We also thank one anonymous reviewer for his suggestion about the possibility of our method on marine swell-noise attenuation. Thanks also to BGP International for financial support of this work. This work is partly supported by The National Basic Research Program of China (973 Program: 2009CB219301). Publication authorized by the Director, Bureau of Economic Geology.