This Web site recently reorganized.

The Geomagnetism Home is now at:

http://www.ngdc.noaa.gov/seg/geomag/

The Gravity Home is now at:

http://www.ngdc.noaa.gov/seg/gravity/

You can follow the links above or you will be automatically redirected to the Land Geophysics Home. Please update your bookmark to the new location. Thank you.