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Holocene Event Record of Aysén Fjord (Chilean Patagonia): an Interplay of Volcanic Eruptions, Crustal and Megathrust Earthquakes 5
Wils, Katleen; Van Daele, Maarten; Lastras, Galderic; Kissel, Catherine; Lamy, Frank; Siani, Giuseppe.
In the first months of 2007, the Aysén region in southern Chile was affected by a crustal seismic swarm. Its largest earthquake (Mw 6.2) occurred in April and had its epicenter in Aysén Fjord. Seismic intensities became so high that hundreds of onshore mass movements were triggered, several of which entered into the fjord, resulting in mass transport deposits (MTDs) preserved at the fjord bottom. Here we present a Holocene record of paleo-earthquakes in the previously unstudied Patagonian fjordland based on MTD stratigraphy. High-resolution seismic data retrieved using two different seismic systems (sparker and TOPAS) reveal multiple older MTDs on different stratigraphic levels. Correlation of the seismic stratigraphy with sedimentological data obtained...
Tipo: Text Palavras-chave: Paleoseismology; Landslides; Seismic stratigraphy; Chile; Fjord.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00417/52854/53755.pdf
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Seismo‐turbidites in Aysén Fjord (Southern Chile) Reveal a Complex Pattern of Rupture Modes Along the 1960 Megathrust Earthquake Segment 5
Wils, Katleen; Daele, Maarten Van; Kissel, Catherine; Moernaut, Jasper; Schmidt, Sabine; Siani, Giuseppe; Lastras, Galderic.
Grain‐size analysis and end‐member modelling of a long sediment core from Aysén Fjord (southern Chile) allows to identify over 25 seismo‐turbidites in the last 9000 years. Considering the shaking intensities required to trigger these turbidites (V½‐VI½), the majority can be related to megathrust earthquakes. Multiple studies in south‐central Chile have aimed at finding traces of giant, tsunamigenic megathrust earthquakes leading to the current 5500‐year‐long paleoseismological record of the Valdivia Segment. However, none of these cover the southern third of the segment. Aysén Fjord allows to fill this data gap and presents the first, crucial paleoseismic data to demonstrate that the 1960 event was not unique for the Valdivia Segment, yielding a recurrence...
Tipo: Text Palavras-chave: Megathrust earthquakes; Turbidite paleoseismology; Valdivia segment; South-central Chile; Variable rupture mode.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00646/75832/76820.pdf
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