L15_SeismicReflectionII-page13 - d w w d d If an interface...

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Applied Geophysics – Seismic reflection II Fresnel Zone Tells us about the horizontal resolution on the surface of a reflector First Fresnel Zone The area of a reflector that returns energy to the receiver within half a cycle of the first reflection The width of the first Fresnel zone, w: 4 2 2 4 2 2 2 2 2 λ + = + =
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Unformatted text preview: + d w w d d If an interface is smaller than the first Fresnel zone it appears as an point diffractor, if it is larger it appears as an interface Example : 30 Hz signal, 2 km depth where α = 3 km/s then λ = 0.1 km and the width of the first Fresnel zone is 0.63 km...
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