Modal 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.

• Main Author: Gambetta, M.
• Other Authors: Gambetta, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
• Format: Manuscript
• Language: English
• Published: 2008
• Subjects: SVD; MAGNETIC ANOMALIES; Antarctic Magnetic Surveys; HRAM; 04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods; Antarctic; Cape Roberts; Antarc*; Antarctica
• Online Access: http://hdl.handle.net/2122/4735

This 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. Submitted 3.8. Geofisica per l'ambiente JCR Journal open