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| a. CASA geodetic data at one standard error compared to elastic half space models with various shallow dip angles on the Atrato-Uraba Fault zone (AUFZ). The 25 mm/a Panama-South America convergence rate was determined using the average of 4 stations from the relatively aseismic stable Panama: CHIT, ALBR, FLAM, CHEP. The displacement includes 3 mm/a shortening on a generalized thrust fault in the East Andean Frontal fault (EAF) system and 3 mm/a eastward component of the strike-slip motion associated with the "escape" of the North Andes Block.
b. East-west cross section A-A' of the collisional zone.
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