Costa Recta beach, Deception Island, West Antarctica: A retreated scarp of a submarine fault?

Deception Island (South Shetlands, Antarctica) is one of the most active volcanoes in Antarctica, having erupted recently in 1967, 1969 and 1970, damaging scientific stations on the island. It is also seismically very active. The island has attracted the attention of many researchers as it constitut...

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Bibliographic Details
Main Authors: Fernández-Ibáñez, F., Pérez-López, R., Martínez-Díaz, J.J., Paredes, C., Giner-Robles, J.L., Caselli, A.T., Ibáñez, J.M.
Format: Article in Journal/Newspaper
Language:unknown
Published: 2005
Subjects:
Active tectonics
Fault escarpment
Straight coast
Tectonic geomorphology
Uplifted terraces
coastal landform
fault scarp
submarine feature
Antarctica
Arctic and Antarctic
Deception Island
South Shetland Islands
World
Arctic
Antarctic
West Antarctica
Argentina
Recta
Macaroni Point
Costa Recta
Antarc*
Ice cap
Online Access:https://hdl.handle.net/20.500.12110/paper_09541020_v17_n3_p418_FernandezIbanez
http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_09541020_v17_n3_p418_FernandezIbanez_oai
Description
Summary:Deception Island (South Shetlands, Antarctica) is one of the most active volcanoes in Antarctica, having erupted recently in 1967, 1969 and 1970, damaging scientific stations on the island. It is also seismically very active. The island has attracted the attention of many researchers as it constitutes an undisturbed natural laboratory to study seismo-volcanic events and how they affect landscape modelling and evolution. One of the most remarkable geological and geomorphological features on Deception Island is the linearity of its easternmost coastal landform, the origin of which remains unknown. Some answers, based on presence of strike-slip fault or on the ice cap and beach geomorphological dynamics, have been reported in the literature. Our new work provides several indications of the existence of a dip-slip submarine fault, parallel to the coast (NNW-SSE), which suggests a tectonic origin for this morphological feature. Uplifted marine terraces, incision of a fluvial network over the ice cap, normal faulting parallel to the coast in the north and south rock heads bounding the beach and sharp shelf-break with rather constant slope, constitute some of this evidence. Terrace uplift and fluvial channel incision decreasing southward from Macaroni Point, indicates possible tilt movement across this inferred fault plane. © Antarctic Science Ltd. Fil:Caselli, A.T. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.

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