FREE-AIR GRAVITY IN MILLIGALS 



DEFLECTION OF THE VERTICAL 

 ARC-SECONOS 



PUERTO RICO 

 TRENCH 



VENEZUELAN 

 BASIN 



DEPTH IN KILOMETERS 



GEOID HEIGHT IN METERS 



o 



00 



o 



o 



CD 

 O 



o 



Figure 14. Profiles of gravity, geoid, and deflection of the vertical from the 

 South American margin across the Venezuelan Sea, Puerto Rico, Puerto 

 Rico Trench into the North Atlantic. These profiles are obtained from 

 geoids in Figures 8, 10, and 13. The "2-D geoid" and the "2-D deflection 

 of the vertical" profiles are obtained from the gravity profile with the 

 assumption of two-dimensionality as explained in the text. Von Arx's 

 deflection of the vertical profile was obtained by the astrogeodetic method. 



23-25 



