Image Name                   :  boug96pr
Boundaries                   :  Lat 15N to 21N ; Lon 292E to 296E
Color Scale, Upper (Red)     :  169 mgals and higher 
Color Scale, Lower (Magenta) : -376 mgals and lower 
Data Max value               :  169 mgals
Data Min value               : -376 mgals
Illuminated from the         :  East 

  This is an image generated from 2'x2'terrain-corrected Bouguer gravity 
anomalies covering Puerto Rico and the Virgin Islands.  Some interesting
features to note about this image are:

  The long E/W purple feature, north of the islands, is the gravitational
signal induced by the Puerto Rico trench.  This trench is the location where
the North American plate transitions past (and, further to the east, subducts
beneath) the Caribbean plate.  The Puerto Rico trench is one of the deepest 
trenches in the Atlantic Ocean, reaching depths in excess of 28,000 feet, 
thus causing significant effects to the geoid in the area.

das/dgm 10/18/96