Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4735
AuthorsGambetta, M. 
TitleModal decomposition of magnetic maps : the case of Cape Roberts aeromagnetic survey, Antarctica.Modal decomposition of magnetic maps : the case of Cape Roberts aeromagnetic survey, Antarctica.
Issue Date2008
URIhttp://hdl.handle.net/2122/4735
KeywordsSVD
MAGNETIC ANOMALIES
Antarctic Magnetic Surveys
HRAM
Subject Classification04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods 
AbstractThis paper proposes a digital enhancement tool for magnetic anomaly maps. The magnetic anomaly map is decomposed by means of Singular Value Decomposition into a number of orthogonal basis. The dataset is then filtered, after eigenvalues evaluation, accordingly to a specific variance pattern. The filtering product is efficient in enhancing subtle and hidden features. The proposed filtering procedure is first tested with a synthetic signal, then it has been applied to the Cape Roberts (Antarctica) aeromagnetic survey, flown over an off-shore rift basin. The proposed method appears to be efficient as noise removal and act as a digital enhancement tools able to provide TMI anomaly maps which can reveal hidden lineaments, otherwise not visible. The results have been checked against independent data.
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