EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements

Journal Article

2009

Published in: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2009GC002471

, S. Maus . 2009

A global Earth Magnetic Anomaly Grid (EMAG2) has been compiled from satellite, ship, and airborne
magnetic measurements. EMAG2 is a significant update of our previous candidate grid for the World
Digital Magnetic Anomaly Map. The resolution has been improved from 3 arc min to 2 arc min, and the
altitude has been reduced from 5 km to 4 km above the geoid. Additional grid and track line data have been
included, both over land and the oceans. Wherever available, the original shipborne and airborne data were
used instead of precompiled oceanic magnetic grids. Interpolation between sparse track lines in the oceans
was improved by directional gridding and extrapolation, based on an oceanic crustal age model. The
longest wavelengths (>330 km) were replaced with the latest CHAMP satellite magnetic field model MF6.
EMAG2 is available at http://geomag.org/models/EMAG2 and for permanent archive at http://earthref.org/
cgi-bin/er.cgi?s=erda.cgi?n=970

• Volume Number: 10
• Issue Number: 8
• Magazine \ Newspaper: G3 Geochemistry, Geophysics, Geosystems
• Pages: 1-12