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Climate-controlled submarine landslides on the Antarctic continental margin
Jenny A Gales1, Robert M McKay2, Laura De Santis3
1School of Biological and Marine Sciences, University of Plymouth, Plymouth, UK. jenny.gales@plymouth.ac.uk.
Antarctic submarine landslides pose a tsunami risk. Weak sediment layers, influenced by climate shifts, preconditioned slopes for failure, likely triggered by glacial rebound seismicity.
Area of Science:
- Geology
- Oceanography
- Tsunamis
Background:
- Antarctica's continental margins present an unknown submarine landslide-generated tsunami risk.
- Understanding slope failure is crucial for assessing geohazards.
Purpose of the Study:
- Investigate preconditioning factors and failure mechanisms of a major submarine landslide complex in the eastern Ross Sea, Antarctica.
Main Methods:
- Multidisciplinary study analyzing sediment lithology and depositional history.
- Identification of weak layers beneath submarine landslides.
Main Results:
- Weak layers composed of diatom oozes and glaciomarine diamicts were identified.
- Lithological variations, driven by glacial-interglacial cycles, preconditioned slopes.
- Seismicity from glacioisostatic readjustment likely triggered landslides.
Conclusions:
- Recurrent Antarctic submarine landslides are linked to preconditioned weak layers and seismic triggers.
- Climate warming and ice retreat may increase seismicity, potentially triggering more landslides.
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