Institutions:

    Carnegie Institute DTM

    University of Arizona Department of Geosciences

    Whitman College Department of Geosciences

Geology/Geophysics:

    IRIS

    USGS NEIC

    PASSCAL

    ISC

    EarthScope

Useful Links:

    GMT Manual

    Topo Grids from GINA

    Topo Grids from NOAA

     Magnetic and Gravity Grids from USGS