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Submarine failures in the bottom of the Aysén fjord, Northern Patagonia, Chile

Authors

  • José F. Araya Vergara Departamento de Geografía, Facultad de Arquitectura y Urbanismo, Universidad de Chile
No. 43 (2011)
https://doi.org/10.5354/0719-5370.2011.18495

Abstract

The present work deals with the relationship between the dislocated sedimentary structures of fjord sub-bottom and the possible sequence of failures in the Aysén Fjordland. The longitudinal profile of the fjord was obtained by means of a 3.5 kHz sub-bottom profiler record, obtained on board of the Vidal Gormaz research vessel. The observations were principally carried out in the ponding esplanade located in the zone of seismic cluster below the fjord. Here, the deformations of the visible sub-bottom affect all the thickness of sediments. There are different styles of deformation of sediments, with greater breakup in the older than in most recent layers. Its 14 C and 210 Pb age extends since the Termination I (Last Glaciation) until the Upper Holocene. Between 1922 and 1995 the earthquake of 1927 happened, giving an inter-seismic period of 80 years until 2007. This earthquake affected with smaller deformation up to the most recent layers judging by its 210Pb age. A sub-bottom record post 2007 earthquake indicates disruptions of the tectonic structures recorded in1995. Therefore: a) the sub-superficial layers of ages between the Holocene and the Termination I can have been deformed also by earthquakes previous to 1927; b) these processes must be recurrent, sleeping, with renewed unbalances; c) its type of frequency must be episodic, oscillating between low (100 to 1000 years) and middle (0 to 100 years); d) its way of activity is by rupture; and e) the known frequency is between ancient-historical and recent historical (1 to 200 years BP or more).    

Keywords:

Fjord, ponding esplanade, submarine failure, frequency, Aysén Fjord

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How to Cite
Araya Vergara, J. F. (2011). Submarine failures in the bottom of the Aysén fjord, Northern Patagonia, Chile. Investigaciones Geográficas, (43), Pág. 17–34. https://doi.org/10.5354/0719-5370.2011.18495
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Investigaciones Geográficas
Facultad de Arquitectura y Urbanismo
Universidad de Chile
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