Geophysical Fields: Links
GEOS 602
Spring 2010
Tu-Th 1:30-3:00, GI Auditorium
Instructor: Jeff Freymueller
x7286 Elvey 413B jeff.freymueller@gi.alaska.eduLast Updated: March 28, 2010
Gravity
The Cox and Chao (2002) paper in Science shows the time evolution of J2. J2 has been getting smaller over time (the earth less oblate, or less bulging in the middle). But starting in 1998 there was a big deviation from that trend. If the link above does not work, try this one.
General information about the gravity field and geodesy is http://earth-info.nima.mil/GandG/wgsegm/
Global Gravity Models
The EGM96 model was developed jointly by NASA and NIMA.The EIGEN-5C model was developed by GFZ-Potsdam, and combines GRACE and LAGEOS mission data plus 0.5 x 0.5 degrees gravimetry and altimetry surface data. Older GFZ EIGEN models are also available.
Alaska Gravity Data
The USGS has published online (and on CD-ROM) the compilation of Alaska gravity data, along with some other useful stuff. It is USGS Data Series 264.Magnetics
The latest IGRF model, IGRF-11, is available from the NGDC.Inverse Theory
Heat Flow
Dr. Jeffrey T. FreymuellerProfessor of Geophysics
Geophysical Institute
University of Alaska, Fairbanks
Fairbanks, AK 99775-7320