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[email protected] [Non Peer-Reviewed Earth ArXiv Preprint – Originally submitted to EPSL, preparing resubmission] Transient rivers characterize evolving crustal-scale flexure in the Corinth Rift David Fernández-Blanco1, Gino de Gelder1, Sean Gallen2, Robin Lacassin1 and Rolando Armijo1 1 Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Univ Paris Diderot, UMR 7154 CNRS, F-75005 Paris, France 2 Geological Institute, Swiss Federal Institute of Technology (ETH), 8092 Zürich, Switzerland Abstract Crustal elastic flexure on the flanks of rift-forming faults is a key feature to characterize continental rifting processes that can be resolved by means of transient river drainages on rift footwalls. Here we show that the elastic flexure dynamics of the uplifting southern shoulder of the rapidly-extending, asymmetric Corinth Rift (Greece) are recorded in 3D by its fluvial network. We explore the evolution of the mechanical flexure of the lithosphere at rift full length by means of DEM-based river profile analysis of a series