|
Technical Papers - Airborne Magnetics
Depth and Structural Index from Normalised Local Wavenumber of 2D Magnetic Anomalies
Ahmed Salem, Nuclear Materials Authority of Egypt, and Richard Smith, Fugro Airborne Surveys, Ottawa.
Abstract
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 the 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 normalisation of the first-order local wavenumber anomalies and provides a generalised 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.
Published in Geophysical Prospecting, January, 2005, Volume 53, pages 83-89.
© 2005 European Association of Geoscientists & Engineers. Single copies of the article may be printed for personal reference, but the article may not be reproduced in paper for bulk copies. Reprint copies must be purchased from Blackwell Science. For more information on Geophysical Prospecting, see the Blackwell Science website.
Download Paper (PDF 100 Kb)
|
Case Studies