Image Name                   :  d96usxi 
Boundaries                   :  Lat 24N to 53N ; Lon 230E to 294E
Color Scale, Upper (Red)     :  16 arcseconds and higher
Color Scale, Lower (Magenta) : -16 arcseconds and lower 
Data Max value               :  38.2 arcseconds
Data Min value               : -33.5 arcseconds
Illuminated from the         :  North

  This is an image generated from 2'x2' N/S surface deflections of the
vertical covering the conterminous United States and surrounding areas.
Some interesting features to note about this image are:

  The mixture of purple (lows) and red (highs) through the western portion
of the image is created by high-frequency geoid changes that are occurring
in relation to similar high-frequency terrain changes throughout the 
Rocky Mountains.

  The nearly E/W linear feature off of the west coast of California
are deflections associated with the Mendocino Fracture zone, a large plate
fracture extending far into the Pacific.

  The large negative signals (magenta) off of the New England coast are
deflections induced by the edge of the continental shelf, which turns
toward the East near New Jersey.

  Large bumps in the Pacific Ocean areas are the effect of sea mounts on the
deflections of the vertical.

das/dgm 10/18/96