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

This data collection is associated with the publication: Maus, S., Barckhausen, U., Berkenbosch, H., Bournas, N., Brozena, J., Childers, V., Dostaler, F., Fairhead, J. D., Finn, C., von Frese, R. R. B., Gaina, C., Golynsky, S., Kucks, R., Lühr, H., Milligan, P., Mogren, S., Müller, R. D., Olesen, O., Pilkington, M., Saltus, R., Schreckenberger, B., Thébault, E., & Caratori Tontini, F. (2009). EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements. Geochemistry, Geophysics, Geosystems, 10(8). doi: 10.1029/2009GC002471
Publication Abstract
A global Earth Magnetic Anomaly Grid (EMAG2) has been compiled from satellite, ship, and airbornemagnetic 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 https://geomag.us/models/index.html.
Authors and Institutions
Stefan Maus - CIRES, University of Colorado at Boulder, USA; National Geophysical Data Center, NOAA, Boulder, Colorado, USA. ORCID: 0000-0002-9604-3878
Udo Barckhausen - Federal Institute for Geosciences and Natural Resources, Hannover, Germany
Heidi Berkenbosch - GNS Science, Avalon, New Zealand
Nasreddine Bournas - Geotech Ltd., Aurora, Ontario, Canada
John Brozena - Marine Physics Branch, Naval Research Laboratory, Washington, D.C., USA
Vicki Childers - National Geodetic Survey, NOAA, Silver Spring, Maryland, USA
F. Dostaler - Geological Survey of Canada, Ottawa, Ontario, Canada
J. Derek Fairhead - GETECH, Leeds, UK; School of Earth and Environment, University of Leeds, UK
Carol Finn - U.S. Geological Survey, Denver, Colorado, USA. ORCID: 0000-0002-6178-0405
Ralph R. B. von Frese - School of Earth Sciences, Ohio State University, Columbus, Ohio, USA
Carmen Gaina - Geological Survey of Norway, Trondheim, Norway
Alexander Golynsky - All-Russian Research Institute for Geology and Mineral Resources of the World Ocean, Saint Petersburg, Russia
Robert Kucks - U.S. Geological Survey, Denver, Colorado, USA
Hermann Lühr - Helmholtz Centre Potsdam, German Research Centre for Geosciences, Potsdam, Germany
Peter Milligan - Geoscience Australia, Canberra, ACT, Australia
Saad Morgen - College of Sciences, King Saud University, Riyadh, Saudi Arabia
R. Dietmar Müller - EarthByte Research Group, School of Geosciences, The University of Sydney, Australia. ORCID: 0000-0002-3334-5764
Odleiv Olesen - Geological Survey of Norway, Trondheim, Norway
Mark Pilkington - Geological Survey of Canada, Ottawa, Ontario, Canada
Richard Saltus - U.S. Geological Survey, Denver, Colorado, USA
Bernd Schreckenberger - Federal Institute for Geosciences and Natural Resources, Hannover, Germany
Erwan Thébault - Institut de Physique du Globe de Paris, Paris, France
Fabio Caratori Tontini - Istituto Nazionale di Geofisica e Vulcanologia, Fezzano, Italy
Overview of Resources Contained
This collection contains gridded global magnetic data, compiled from satellite, marine, aeromagnetic and ground magnetic surveys. These data are available as .pdf and .jpg images and posters, as a Google Earth .kmz grid, as ASCII grids, as netCDF grids, and as georeferenced GeoTIFF images. The grids can also be visualised interactively online using the GPlates Web Portal.