EMAG 2 : A 2 – arc min resolution Earth Magnetic Anomaly

[1] 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.

[1]  Walter R. Roest,et al.  Age, spreading rates, and spreading asymmetry of the world's ocean crust , 2008 .

[2]  Hermann Lühr,et al.  Fifth‐generation lithospheric magnetic field model from CHAMP satellite measurements , 2007 .

[3]  C. Laj,et al.  Magnetic Anomalies Over Oceanic Ridges , 1963, Nature.

[4]  P. Betts,et al.  High‐resolution aeromagnetic data over central Australia assist Grenville‐era (1300–1100 Ma) Rodinia reconstructions , 2008 .

[5]  H. Frey,et al.  Constraints on the crustal nature and tectonic history of the Kerguelen Plateau from comparative magnetic modeling using MAGSAT data , 1988 .

[6]  William J. Hinze,et al.  The Utility of Regional Gravity and Magnetic Anomaly Maps , 1985 .

[7]  Michael E. Purucker,et al.  Magnetic anomaly map of the world , 2007 .

[8]  Kazuo Kobayashi,et al.  A new Mesozoic isochron chart of the northwestern Pacific Ocean: Paleomagnetic and tectonic implications , 1992 .

[9]  Nils Olsen,et al.  The 10th generation international geomagnetic reference field , 2005 .

[10]  M. Menvielle,et al.  Geomagnetic Indices in Solar-Terrestrial Physics and Space Weather , 2007 .

[11]  G. Bokelmann,et al.  Comparing crustal and mantle fabric from the North American craton using magnetics and seismic anisotropy , 2009 .

[12]  C. Carmisciano,et al.  The revised aeromagnetic anomaly map of Italy , 2004 .

[13]  J. Faleide,et al.  Crustal-scale architecture and segmentation of the Argentine margin and its conjugate off South Africa , 2009 .

[14]  A. Golynsky,et al.  The composite magnetic anomaly map of the East Antarctic , 2002 .

[15]  Ralph Müller,et al.  Major Australian-Antarctic Plate Reorganization at Hawaiian-Emperor Bend Time , 2007, Science.

[16]  R. Saltus,et al.  Regional magnetic anomalies, crustal strength, and the location of the northern Cordilleran fold-and-thrust belt , 2007 .

[17]  S. Maus.  The geomagnetic power spectrum , 2008 .

[18]  Hermann Lühr,et al.  Resolution of direction of oceanic magnetic lineations by the sixth‐generation lithospheric magnetic field model from CHAMP satellite magnetic measurements , 2008 .

[19]  Dhananjay Ravat,et al.  National Geophysical Data Center candidate for the World Digital Magnetic Anomaly Map , 2007 .

[20]  F. J. Vine,et al.  Spreading of the Ocean Floor: New Evidence , 1966, Science.

[21]  Michael T. Chandler,et al.  Improving the quality of marine geophysical track line data: Along‐track analysis , 2008 .

[22]  Nils Olsen,et al.  Extending comprehensive models of the Earth's magnetic field with Ørsted and CHAMP data , 2004 .

[23]  R. Blakely.  Potential theory in gravity and magnetic applications , 1996 .

[24]  P. S. Millegan,et al.  Geologic Applications of Gravity and Magnetics: Case Histories , 1998 .

[25]  W. J. Hinze,et al.  Magnetic Field of the Earths Lithosphere The: The Satellite Perspective , 1998 .

[26]  T. Hildenbrand,et al.  Regional Crustal Structures and Their Relationship to the Distribution of Ore Deposits in the Western United States, Based on Magnetic and Gravity Data , 2000 .

[27]  Kumar Hemant,et al.  Geological modeling of the new CHAMP magnetic anomaly maps using a geographical information system technique , 2005 .