Magnetic anomaly map of the world: merging satellite, airborne, marine and ground-based magnetic data sets

Kumar Hemant, Erwan Thébault, Mioara Mandea, Dhananjay Ravat, Stefan Maus

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

We report here a simple but practical method to combine systematically the magnetic surveys of disparate specifications from marine, ground, aeromagnetic and satellite platforms that aims to be helpful in the framework of the world digital magnetic anomaly map project. Because the satellite coverage and data quality is more uniform than near-surface surveys, it is adopted as the base map for wavelengths larger than 400 km and up to spherical harmonic degree inclusive of 16 (∼ 2500 km). After checking that satellite models and large aeromagnetic wavelengths are not consistent, we filter out wavelengths longer than 400 km in aeromagnetic compilations. Existing regional grids and, when available, individual surveys, are merged to give a more uniform spatial variation of the magnetic anomalies. The effects of merging the grids are examined by plotting profiles and difference maps of the overlapping regions. A preliminary global map is obtained after combining the magnetic anomaly map with the downward continued CHAMP satellite derived magnetic anomaly map. Forthcoming availability of new datasets, as well as improvements in the procedure, will help to produce increasingly reliable maps.

Original languageEnglish
Pages (from-to)56-71
Number of pages16
JournalEarth and Planetary Science Letters
Volume260
Issue number1-2
DOIs
StatePublished - Aug 15 2007

Bibliographical note

Funding Information:
We thank two anonymous referees for numerous helpful suggestions to improve this manuscript. We would like to acknowledge all geological surveys and group members listed in Table 1 who provided aeromagnetic and marine magnetic anomaly data for World Digital Magnetic Anomaly project. We kindly thank Juha Korhonen and other members of the WDMAM task force for their successful negotiations with various organisations and data holders. The CHAMP satellite mission is operated and supported by GeoForschungsZentrum Potsdam, the German Aerospace Center (DLR) and the German Federal Ministry of Education and Research (BMBF).

Funding

We thank two anonymous referees for numerous helpful suggestions to improve this manuscript. We would like to acknowledge all geological surveys and group members listed in Table 1 who provided aeromagnetic and marine magnetic anomaly data for World Digital Magnetic Anomaly project. We kindly thank Juha Korhonen and other members of the WDMAM task force for their successful negotiations with various organisations and data holders. The CHAMP satellite mission is operated and supported by GeoForschungsZentrum Potsdam, the German Aerospace Center (DLR) and the German Federal Ministry of Education and Research (BMBF).

FundersFunder number
Bundesministerium für Bildung und Forschung
Deutsches Zentrum für Luft- und Raumfahrt
Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ

    Keywords

    • LEEDS-WDMAM candidate model
    • aeromagnetic and marine compilation
    • world digital magnetic anomaly map

    ASJC Scopus subject areas

    • Geophysics
    • Geochemistry and Petrology
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science

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