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Depth and structural index from normalized local wavenumber of 2D magnetic anomalies
Author(s) -
Salem Ahmed,
Smith Richard
Publication year - 2005
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.2005.00435.x
Subject(s) - wavenumber , magnetic anomaly , normalization (sociology) , magnetic field , geology , noise (video) , field (mathematics) , computational physics , geophysics , statistical physics , physics , optics , mathematics , computer science , quantum mechanics , artificial intelligence , sociology , anthropology , pure mathematics , image (mathematics)
Recent improvements in the local wavenumber approach have made it possible to estimate both the depth and model type of buried bodies from magnetic data. However, these improvements require calculation of third‐order derivatives of the magnetic field, which greatly enhances noise. As a result, the improvements are restricted to data of high quality. We present an alternative method to estimate both the depth and model type using the first‐order local wavenumber approach without the need for third‐order derivatives of the field. Our method is based on normalization of the first‐order local wavenumber anomalies and provides a generalized equation to estimate the depth of some 2D magnetic sources regardless of the source structure. Information about the nature of the sources is obtained after the source location has been estimated. The method was tested using synthetic magnetic anomaly data with random noise and using three field examples.