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The downward continuation of the tilt angle
Author(s) -
Cooper Gordon
Publication year - 2016
Publication title -
near surface geophysics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.639
H-Index - 39
eISSN - 1873-0604
pISSN - 1569-4445
DOI - 10.3997/1873-0604.2016022
Subject(s) - tilt (camera) , geology , economic geology , interference (communication) , amplitude , continuation , gemology , fourier analysis , noise (video) , regional geology , magnetic dip , fourier transform , geometry , geodesy , engineering geology , hydrogeology , optics , mathematical analysis , mathematics , geophysics , telmatology , physics , computer science , seismology , geotechnical engineering , channel (broadcasting) , artificial intelligence , image (mathematics) , computer network , tectonics , programming language , volcanism
The tilt angle filter T can be used both to enhance images of aeromagnetic data and as the basis of semi‐automatic interpretation methods. For vertically magnetised and vertically dipping contacts, rescaling T by factor α is equivalent to computing T from sources with all depths decreased by a factor α . This downward continuation is much less sensitive to noise than Fourier transform‐based downward continuation techniques, and because it reduces interference, it allows more accurate source depth determination from methods such as the tilt‐depth method. The method can be applied irrespective of the source and magnetisation type if the tilt angle of the analytic signal amplitude is used.