Premium
SEISMIC MODEL EXPERIMENTS CONCERNING REFLECTED REFRACTIONS *
Author(s) -
KOEFOED O.,
EWYK J. G.,
BAKKER W. T.
Publication year - 1958
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.1365-2478.1958.tb01661.x
Subject(s) - oblique case , reflection (computer programming) , geology , strips , fault (geology) , optics , seismology , barium titanate , geometry , physics , materials science , dielectric , composite material , programming language , philosophy , linguistics , mathematics , optoelectronics , computer science
Seismic model experiments are described in which long strips of plexiglass were used as models. One end of the strip was sawn off at an oblique angle and, at the opposite end, the strip was excited by means of a barium titanate transducer. The experiments showed that, if the width of the strip was sufficiently small, an anomalous reflection against the oblique end occurred which travelled in the longitudinal direction of the strip. This anomalous reflection did not occur when the width of the strip was large. These results are explained on the basis of Fresnel's theory. It is inferred that, in the subsurface, refracted waves may be reflected against fault planes without the law of reflection being satisfied, provided that the refracted wave is propagated in a sufficiently thin high velocity layer.