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INVERSION OF FIRST‐BREAK TRAVELTIME DATA OF DEEP SEISMIC REFLECTION PROFILES 1
Author(s) -
RÜHL THOMAS,
LÜSCHEN EWALD
Publication year - 1990
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.1365-2478.1990.tb01844.x
Subject(s) - statics , geology , geodetic datum , inversion (geology) , synthetic data , economic geology , reflection (computer programming) , seismology , computation , anisotropy , regional geology , engineering geology , crust , geodesy , mineralogy , geophysics , algorithm , optics , metamorphic petrology , tectonics , computer science , physics , classical mechanics , volcanism , programming language
A bstract First breaks of 2D deep reflection data were used to construct velocity‐depth models for improved static corrections to a deeper datum level and for geological interpretations. The highly redundant traveltime data were automatically picked and transformed directly into a velocity‐depth model by maximum depth methods such as the Giese‐ and the Slichter‐method. Comparisons with the results of synthetic calculations and a tomographic approach using iterative inversion methods (ART, SIRT) showed that maximum depth methods provide reliable velocity models as a basis for the computation of static corrections. These methods can economically be applied during data acquisition in the field. They provide particularly long‐period static anomalies, which are of the order of 20–40 ms (0.5‐1 wavelength) within CMP gathers of an example of a deep reflection profile in SW‐Germany sited on crystalline basement. Reprocessing of this profile, which was aimed at the comparison between the effects of the originally used and the new statics, did not result in dramatically improved stacking quality but showed a subtle influence on the detailed appearance of deep crustal events.