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# Layers revealed by scattered wave filtering

Waves occur in almost all branches of physics.
We are going to study waves,
but here we will not assume
knowledge of physics and differential equations.
We will use only assumptions about the
general principles of delay,
continuity,
and energy conservation.
The results will be directly applicable to sound waves,
water waves,
light in thin films,
normal incident elastic waves of both
pressure and shear type,
electromagnetic waves,
transmission lines,
electrical ladder networks,
and other such things.
The methods can also be applied to diffusion problems.
Our first main objective is to solve the problem
of calculating wave fields given reflection coefficients.
Our second main objective
is to gain the ability to calculate the
reflection coefficients given the observed waves.

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Stanford Exploration Project

10/30/1997