TY  - STD
AU  - Hamoudi M., Lesur V.
PY  - 2007//
TI  - Spectral Analysis of the Global Lithospheric Magnetic Anomaly Field derived from Airborne, shipborne, and satellite Data
N2  - Several candidate grids were submitted for evaluation in the framework of the World Digital MagneticAnomaly Map (WDMAM) project. A standard way of evaluating the final grids is to compare them withoriginal gridded data in order to verify that the geomagnetic information have been properly securedduring the final stage of the processing. Nevertheless, the original data and grids used for the WDMAM have themselves heterogeneous qualities and resolutions and the lack of metadata information about the raw data makes it difficult to assess the consistency and the resolution of the magnetic anomalies everywhere.In this paper, we use the Geoforschungszentrum MAgnetic Anomaly Map (GAMMA)candidate grid as an input to derive a spherical harmonic model to degree and order 500 .The harmonic decomposition allows to analyze the global magnetic spectrum of the map. The results are then compared to local wavelet spectral analysis of the grid in order to find out the effective spectral content of the WDMAM and to obtain some constrains on the source depths and Curie isotherm determination. This extra information will prove useful for more cautious geological interpretations based on the WDMAM grid.
N1  - exported from refbase (http://publi.ipev.fr/polar_references/show.php?record=5858), last updated on Fri, 20 Nov 2009 11:01:08 +0100
ID  - HamoudiM.2007
ER  -