Co- and postseismic subaquatic evidence for prehistoric  fault activity near Coyhaique, Aysén Region, Chile

Vervoort, Morgan; Wils, Katleen; Vanneste, Kris; Urrutia, Roberto; Pino, Mario; Kissel, Catherine; De Batist, Marc; Van Daele, Maarten

doi:https://doi.org/10.5194/nhess-24-3401-2024

Articles | Volume 24, issue 10

https://doi.org/10.5194/nhess-24-3401-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/nhess-24-3401-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 10

Research article

|

07 Oct 2024

Research article |

| 07 Oct 2024

Co- and postseismic subaquatic evidence for prehistoric fault activity near Coyhaique, Aysén Region, Chile

Morgan Vervoort, Katleen Wils, Kris Vanneste, Roberto Urrutia, Mario Pino, Catherine Kissel, Marc De Batist, and Maarten Van Daele

Supplement

https://doi.org/10.5194/nhess-24-3401-2024-supplement

Data sets

Grainsize data MD07-3117_IX M. Vervoort https://doi.org/10.6084/m9.figshare.27087505.v1

Geochemistry data MD07-3117_IX M. Vervoort https://doi.org/10.6084/m9.figshare.27087523.v1

Bathymetry map Lago Pollux M. Vervoort https://doi.org/10.6084/m9.figshare.27100579.v1

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Short summary

This study identifies a prehistoric earthquake around 4400 years ago near the city of Coyhaique (Aysén Region, Chilean Patagonia) and illustrates the potential seismic hazard in the region. We found deposits in lakes and a fjord that can be related to subaquatic and onshore landslides, all with a similar age, indicating that they were most likely caused by an earthquake. Through modeling we found that this was an earthquake of magnitude 6.3 to 7.0 on a fault near the city of Coyhaique.