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QUELQUES EXEMPLES DE DIFFRACTIONS EN SISMIQUE‐REFRACTION ET LEUR APPLICATION A LA DETERMINATION DES VITESSES VERTICALES *
Author(s) -
LEDOUX Y.
Publication year - 1957
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.1365-2478.1957.tb01441.x
Subject(s) - geology , overburden , refraction , tectonics , diffraction , seismology , geomorphology , geodesy , mineralogy , optics , physics , geotechnical engineering
The progress in the registration of refraction shots obtained in the last years permits a more systematic study of the secondary arrivals. In zones with disturbed tectonics, a noticeable portion of the received energy derives from diffraction phenomena caused by velocity anomalies in the marker bed or in the overburden (faults, local heterogeneities). Some characteristic examples are presented and schematically explained. A more advanced analysis of the branches of the travel time curve caused by diffraction leads, in favourable cases, to a new method of calculating the offsets and the vertical velocities, independent of the usual methods for the determination of these parameters.