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Analysis of eleven years of deformation measured by GPS in the Corinth Rift Laboratory area

Abstract : 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 mmyr−1 accuracy. Peloponnesos moves at 30 mmyr−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 mmyr−1 near Aigion. Both sides of the rift behave as clockwise rotating blocks with rates of 7 ± 0.5◦ Myr−1 and 2.8±0.8◦ Myr−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 mmyr−1. This implies long recurrence periods for large earthquakes on these faults.
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Antonio Avallone, Pierre Briole, Amalia Maria Agatza-Balodimou, Harilaos Billiris, Olivier Charade, et al.. Analysis of eleven years of deformation measured by GPS in the Corinth Rift Laboratory area. Comptes Rendus Géoscience, Elsevier Masson, 2004, 336, pp.301-311. ⟨10.1016/j.crte.2003.12.007⟩. ⟨hal-01399779⟩



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