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Authors: Robertson, Jennifer* 
Roberts, G. P.* 
Iezzi, Francesco* 
Meschis, Marco* 
Gheorghiu, D. M.* 
Sahy, Diana* 
Bristow, C.* 
Sgambato, C.* 
Title: Distributed normal faulting in the tip zone of the South Alkyonides Fault System, Gulf of Corinth, constrained using 36Cl exposure dating of late-Quaternary wave-cut platforms
Journal: Journal of Structural Geology 
Series/Report no.: /136 (2020)
Publisher: Elsevier
Issue Date: 2020
DOI: 10.1016/j.jsg.2020.104063
Keywords: Crustal Deformation
Active Faults
Absolute Dating
Marine terraces
Abstract: The geometry, rates and kinematics of active faulting in the region close to the tip of a major crustal-scale normal fault in the Gulf of Corinth, Greece, are investigated using detailed fault mapping and new absolute dating. Fault offsets have been dated using a combination of 234U/230Th coral dates and in situ 36Cl cosmogenic exposure ages for sediments and wave-cut platforms deformed by the faults. Our results show that deformation in the tip zone is distributed across as many as eight faults arranged within ~700 m across strike, each of which deforms deposits and landforms associated with the 125 ka marine terrace of Marine Isotope Stage 5e. Summed throw-rates across strike achieve values as high as 0.3–1.6 mm/yr, values that are comparable to those at the centre of the crustal-scale fault (2–3 mm/yr from Holocene palaeoseismology and 3–4 mm/yr from GPS geodesy). The relatively high deformation rate and distributed deformation in the tip zone are discussed in terms of stress enhancement from rupture of neighbouring crustal-scale faults and in terms of how this should be considered during fault-based seismic hazard assessment.
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