Abstract
Abstract BUJALESKY, G.G., 2012. Tsunami overtopping fan and erosive scarps at Atlantic Coast of Tierra Del Fuego. The Ensenada de la Colonia embayment, NE Tierra del Fuego, presents an extensive and wide Holocene beach ridge plain composed of gravel and coarse sand. These deposits have revealed a regressive behavior since 6000 years BP. A Pleistocene gravel beach ridge plain was recognized in the area. Several erosive scarps are present at the embayment, indicating strong and episodic erosive events. Seaward and immediately behind the present storm berm, a high and unique overtopping fan develops. Tierra del Fuego is a seismic area, and the subduction zone of the South Sandwich Islands constitutes a potential source of tsunamis. The abrasion platform of embayment shows a glacifluvial carved paleomorphology. This feature conditions the wave refraction pattern, concentrating the orthogonal rays in its central section. In this setting, a tsunami backwash could generate megavortexes in the nearshore zone of t...
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