Wavelet denoising of magnetic prospecting data


Basiliki Tsivouraki-Papafotiou, Gregory N. Tsokas  and  Panagiotis Tsurlos


(Received 13 January 2005; accepted 7 March 2005)


Laboratory of Exploration Geophysics, Department of Geophysics, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.

Tel: +2310 998507, Fax: +2310 998528, email: gtsokas@geo.auth


ABSTRACT: A denoising scheme is presented suitable for magnetic exploration data. It is based on an empirical study and combines the shift invariant denoising method with the use of a variable threshold, which is calculated in each cycle of the shift invariant algorithm. The calculation of each threshold is based on the wavelet transformation of random noise with the same standard deviation as in the data. The scheme is particularly useful in “archaeological geophysics” where it is important to produce results that mostly resemble the plane view of the buried objects.