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The Aigion fault is one of the youngest major normal faults in the Gulf of Corinth, Greece, and has an immature displacement profile. Based on geometry, slip rate, and comparison with regional faults, we estimate the fault system length as ~10 km. The slip rate of the fault system is ~3.5 [+ or -] 1 mm/yr, decreasing to ~2.5 [+ or -] 0.7 mm/yr close to its eastern tip. Complex fault geometry and displacement profiles on the shelf east of Aigion are consistent with the latter as the eastern tip location. Analysis of slip on this fault system and the established fault to the south (western Eliki fault) suggests that slip was transferred rapidly but not homogeneously between the two faults during the period of contemporaneous activity. Together with a lack of evidence of lateral propagation at the eastern fault tip in the past 10-13 k.y., we suggest that the fault developed and established its current length rapidly, within its 200-300 k.y., history. These results contribute to our understanding of the process of northward fault migration into the rift and the development of new normal faults. Keywords: Corinth rift, normal faults, continental rifting, fault development.

Discrimination between different lithospheric extension models focusing on the roles of low-angle vs. high-angle faulting, and how strain is distributed, requires high-fidelity imaging of brittle deformation. High-resolution seismic reflection and multibeam bathymetric data in the western Gulf of Corinth continental rift were collected to establish the contribution of offshore faults to extension. Onshore fault slip here is significantly less than expected from geodetic strain rates. The rift at this location is a half-graben tilted to the north by S-dipping faults within the uppermost crust. A basement horst on the northern margin is uplifted by the North and South Eratini faults, and the axial channel is fault controlled. Subsided lowstand shorelines in the hanging wall of the North Eratini and the well-studied Aigion fault suggest that the faults have similar displacements. Summed extension from the four major faults across this part of the rift (Eliki, Subchannel, South Eratini, North Eratini) is ~8-16 mm/yr, thereby reconciling geologic and geodetic data sets. Distributed deformation across isolated multiple faults can model this part of the rift without recourse to, and potentially incompatible with, an underlying low-angle detachment. Keywords: riffs, Corinth, Greece, normal faults, bathymetry, seismic reflection profiles.