In oblique convergent subduction areas, an obliquity increase should produce a slip rate increase on trench parallel strike-slip faults and thus the fore-arc platelet should be stretched. Along the Great Sumatran Fault (GSF), that is associated with the oblique convergent Sunda Arc, a northward increase of the GSF slip rate occurs parallel with the convergence obliquity. Transpressional back-arc deformation accommodates part of the GSF slip rate variation while no significant fore-arc stretching is observed. The Sumatran case shows that oblique convergence may be accommodated by deformation of a 500-km-wide zone, from the fore-arc to the back-arc domains. ¿ American Geophysical Union 1995