Modal decomposition of magnetic maps: the case of Cape Roberts aeromagnetic survey, Antarctica.

• Main Author: Marco Gambetta
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Key words; Magnetic maps production; Digital Enhancement; SVD; HRAM; Antarctic Magnetic Surveys; Antarctic; Cape Roberts; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.622.328; http://www.earth-prints.org/bitstream/2122/4735/1/Modal decomposition of magnetic maps - manuscript 2.pdf

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.