GPS (Global Positioning System) data collected in the Corinth Rift during eleven campaigns between 1990 and 2001 provide velocities of 57 points with ∼ 1 . 5 mm yr - 1 accuracy. Peloponnesos moves at 30 mm yr - 1 to the N215° E with respect to a fixed Europe. Extension across the rift is accommodated in a narrow band offshore. Its rate increases from east to west and is 16 mm yr - 1 near Aigion. Both sides of the rift behave as clockwise rotating blocks with rates of 7 ± 0 . 5 ° M yr - 1 and 2 . 8 ± 0 . 8 ° M yr - 1 , respectively for the northern and southern blocks. After removing block rotations, the northern block shows a north–south extension rate of 120 ± 50 nstrain yr - 1 , whereas the southern block indicates the internal deformation is still inside the error bar ( < 20 nstrain yr - 1 ). The strain accumulation across the major faults located along the southern coast of the Corinth Gulf is less than 1 mm yr - 1 . This implies long recurrence periods for large earthquakes on these faults.

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