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MEASUREMENTS ON THE ARRIVAL REFRACTED FROM A THIN HIGH SPEED LAYER *
Author(s) -
DONATO R. J.
Publication year - 1965
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1965.tb01940.x
Subject(s) - amplitude , wavelength , attenuation , refracting telescope , optics , constant (computer programming) , physics , geology , materials science , computer science , programming language
A bstract A theory is developed to predict the amplitude and velocity of the first arrival produced by a thin solid refractor embedded in a solid environment. Laboratory experiments on a three dimensional model substantially confirm the theory. The essential conclusion may be found in Figure 8 where it is shown that for a constant wavelength, and for thicknesses up to about one half a wavelength, the attenuation per unit distance decreases monotonically with increase of refractor thickness. The assumption is made that the amplitude, A , attenuates as ( x ) ‐n exp(‐β x ), where x is horizontal distance and n and β are constants. It is emphasised that it is difficult to obtain reliable values for n and β from the initial amplitude measurements.