Consulta: subjectFacets:"Turbidite paleoseismology"
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Data/hora: 27/07/2024 02:45:11

Seismo‐turbidites in Aysén Fjord (Southern Chile) Reveal a Complex Pattern of Rupture Modes Along the 1960 Megathrust Earthquake Segment
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: 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