National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map

Abstract

[1] 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.Components: 5515 words, 5 figures, 1 table.

International Geomagnetic Reference Field: the 12th generation

“…For example, one cannot recover the original full-field measurement from an aeromagnetic anomaly map if one does not know which generation of the IGRF was used. This issue has important consequences when comparing magnetic surveys carried out at different epochs (e.g., Hamoudi et al 2007;Hemant et al 2007;Maus et al 2007). …”

An integrated geophysical study of Vestbakken Volcanic Province, western Barents Sea continental margin, and adjacent oceanic crust

“…9b) Fig. 8 a) Bouguer anomalies (Minakov 2011) and b) Total magnetic intensity anomalies (Maus et al 2007) for the same area as in Fig. 2.…”

“…The WDMAM grid (Maus et al 2007) was used to generate a magnetic anomaly map (Fig. 8b) and the magnetic seafloor spreading anomalies interpreted by Engen et al (2008) were used to determine age of the oceanic crust (Figs.…”

GIS based 3D visualization of subsurface and surface lineaments / faults and their geological significance, northern tamil nadu, India

“…The gravity DEM (Figure 3) of the study area was visualized in multiple angle and the gravity breaks were demarcated as basement lineaments / faults ( Figure 3A). Similarly, the magnetic data collected from the World Digital Magnetic Anomaly Map (Maus et al, 2007) was used to generate a magnetic DEM of the study area. This magnetic DEM was similarly visualized in 3D analyst module of ArcGIS for the extraction of magnetic breaks or magnetic lineaments ( Figure 3B).…”