National geophysical data center candidate for the world digital magnetic anomaly map

S. Maus, T. Sazonova, K. Hemant, J. D. Fairhead, Dhananjay Ravat

Research output: Contribution to journalArticlepeer-review

130 Scopus citations

Abstract

Marine and airborne magnetic anomaly data have been collected for more than half a century, providing global coverage of the Earth. Furthermore, the German CHAMP satellite is providing increasingly accurate information on large-scale magnetic anomalies. The World Digital Magnetic Anomaly Map project is an international effort to integrate all available near-surface and satellite magnetic anomaly data into a global map database. Teams of researchers were invited to produce candidate maps using a common pool of data sets. Here we present the National Geophysical Data Center (NGDC) candidate. To produce a homogeneous map, the near-surface data were first line-leveled and then merged by Least Squares Collocation. Long wavelengths were found to agree surprisingly well with independent satellite information. This validates our final processing step of merging the short-wavelength part of the nearsurface data with long-wavelength satellite magnetic anomalies.

Original languageEnglish
Article numberQ06017
JournalGeochemistry, Geophysics, Geosystems
Volume8
Issue number6
DOIs
StatePublished - Jun 2007

Keywords

  • Aeromagnetic survey
  • Crustal field
  • Geomagnetic field
  • Marine magnetic data
  • Satellite geomagnetism

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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