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

Full description

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.