Abstract
This study used sedimentary archives obtained from a high-standing terrace along the coastal zone of the Coquimbo region to reconstruct past extreme events (floods and tsunamis). Using sedimentological (grain size), geochemical (XRF), and geochronological (14C and 137Cs) analyses, we identified nine flood deposits (1957, 1965, 1984, 1987, 1991, 1997, 2002, 2015, and 2017) and one tsunami deposit (1922). The sedimentary flood record appears complete for the last 70 years and is useful for reconstructing paleoflood events, highlighting the relevance of coastal high-standing terraces to improve our understanding of the frequency of floods in Chilean coastal areas.
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Acknowledgements
The authors are grateful for the financial support of the Project Fondec-yt#1140851/Fondecyt #1180413 and the international cooperation project Conicyt related to the ANID scholarship program within the framework of the DOCTORATE SCHOLARSHIP CONTEST ABROAD, SCHOLARSHIPS CHILE, CALL 2017/Folio 72180323. We extend our gratitude to the CLAP program (Concurso de Fortalecimiento al Desarrollo Científico de Centros Regionales 2020-R20F0008-CEAZA) and to ANID—Millennium Science Initiative ProgramNucleo Milenio UPWELL (NCN19_153), contributors to the completion of this study. We also thank the staff of the oceanography laboratory of Universidad Católica del Norte. In addition, we are grateful to Anne Bocquet-Liénard and Juliette Dupré of the Archeology Laboratory at the Center Michel-de-Boüard/CRAHAM (UMR 6273) of Normandy University, Unicaen, CNRS, Magalie Legrain M2C Caen of Normandy University for allowing us to conduct granulometric and chemical analyses.
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This work was funded by the following projects: Fondecyt#1140851/Fondecyt #1180413, CLAP program (Concurso de Fortalecimiento al Desarrollo Científico de Centros Regionales 2020-R20F0008-CEAZA), ANID scholarship program (CONICYT), ANID—Millennium Science Initiative Program Nucleo Milenio UPWELL (NCN19_153).
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KA performed the granulometry and geochemical analysis, analyzed the data, prepared figures and tables, authored the drafts of the paper and approved the final draft. PM, LD and AM worked on the data analysis, prepared figures and tables, authored and/or reviewed drafts of the paper and approved the final draft. PO-U, BAA and OK helped with the geochemical interpretations and dating methods, and reviewed and approved the final drafts. MC performed gamma-spectrometry analyses, helped with the interpretation of 210Pb and 137Cs data, and approved the final drafts. All authors have read and agreed to the published version of the manuscript.
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Araya, K., Dezileau, L., Muñoz, P. et al. Reconstruction of extreme floods and tsunamis from coastal sedimentary archives in Los Choros, Coquimbo region, 28°S, Chile. Nat Hazards (2024). https://doi.org/10.1007/s11069-024-06644-8
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DOI: https://doi.org/10.1007/s11069-024-06644-8