Modes to replace transitional asymptotic ray fields in a vertically inhomogeneous earth model |
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| Authors: | E Niver A Kamel L B Felsen |
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| Institution: | Department of Electrical Engineming, New Jersey Institute of Technology, Newark, New Jersey 07102, USA;Department of Electrical Engineering and Computer Science l Microwave Research Institute, Polytechnic Institute of New York, Route 110, Farmingdale, New York I1735, USA |
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| Abstract: | Summary. Asymptotic ray theory (ART) fails in transition regions near critically reflected, bottom glancing or caustic-forming rays in a vertically inhomogeneous layered earth. These deficiencies are repaired here by replacing the transitional ray fields with guided modes plus truncation remainders. Exact ray-mode equivalences and their high-frequency asymptotic approximations are formulated, and their validity and efficiency are verified by numerical comparisons for SH motion in a two-layer earth model comprised of an inhomogeneous sediment above an homogeneous semi-infinite bedrock. |
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