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This study presents a transnational geomorphological map of the Southern Bight, North Sea, using bathymetric data (EMODnet – c. 115 m horizontal resolution; UKHO – 4 m horizontal resolution). Based on the erosional and/or depositional relationship of the mapped features, a first step is established towards the reconstruction of the evolution of the Axial Channel, i.e. a major geomorphological feature on the southern North Sea seafloor. It reveals that the present-day Axial Channel reflects four distinct phases that occurred throughout the Pleistocene: a glacial phase, a major, regional scale fluvial dominated phase – that evolved after the glacial phase; a short-lived, high-energy drainage event; and a last, tidal dominated marine phase. These findings contribute to a refined understanding of the Southern Bight’s geomorphological evolution and offer a framework for future palaeo-environmental and stratigraphic studies in the region.

Chilean Patagonia is confronted with several geohazards due to its tectonic setting, i.e., the presence of a subduction zone and numerous fault zones, e.g., the Liquiñe-Ofqui Fault Zone (LOFZ). This region has therefore been the subject of numerous paleoseismological studies. However, this study reveals that the seismic hazard is not limited to these large tectonic structures by identifying past fault activity near Coyhaique in Aysén Region. Mass-wasting deposits in Lago Pollux, a lake located ca. 15 km SW of this region's capital, were identified through analysis of reflection-seismic data and were linked to a simultaneous event recorded in nearby Lago Castor. Furthermore, a coeval ∼50-year-long catchment response was identified in Aysén Fjord based on the multiproxy analysis of a portion of a sediment core. Assuming that this widely recognized event was triggered by an earthquake, ground-motion modeling was applied to derive the most likely magnitude and source fault. The model showed that an earthquake rupture along a local fault, in the vicinity of Lago Pollux and Lago Castor, with a magnitude of 5.6–6.8, is the most likely scenario.