Magnetic Anomaly Data

 

Magnetic anomalies, http://maps.ngdc.noaa.gov/viewers/geophysics/

  • Download in MGD77T Tab-Delimited Format.  If you have a large area, the single file option may be too big to load into Excel.
  • Open in Excel, save as CSV (currently problem with direct MD import; may also have to fix missing dates; you can also remove unwanted fields to make the file smaller)
  • Open CSV file in MD to create a point database
  • Create area/line shape file from points
    • Set file name
    • No to area to get line
    • Yes to 3D,  pick the MAG_RES for the z component,  There are issues with some cruises, with MAG_TOT and MAG_RES flipped.  You could also consider using MAG_DICORR, although is missing for many cruises.
    • Yes to Multiple records, pick SURVEY_ID to be the splitting field, and the name for the
    • Leave the thinning factor at 1.

Edit the lines file to add:


http://www.soest.hawaii.edu/PT/GSFML/ML/index.html

Seton, M., J. Whittaker, P. Wessel, R. D. Muller, C. DeMets, S. Merkouriev, S. Cande, C. Gaina, G. Eagles, R. Granot, J. Stock, N. Wright, S. Williams, 2014, Community infrastructure and repository for marine magnetic identifications, Geochemistry, Geophysics, Geosystems,  DOI:10.1002/2013GC005176


Global Seafloor Fabric

http://www.soest.hawaii.edu/PT/GSFML/SF/index.html


Last revision 1/31/2016