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Development and emplacement of Ana Slide, Eivissa Channel, Western Mediterranean Sea
Citation Link: https://doi.org/10.15480/882.4786
Publikationstyp
Journal Article
Date Issued
2022-11-15
Sprache
English
Institut
TORE-DOI
Volume
23
Issue
11
Article Number
e2022GC010469
Citation
Geochemistry, Geophysics, Geosystems 23 (11): e2022GC010469 (2022-11)
Publisher DOI
Scopus ID
Publisher
Wiley
Submarine landslides can destroy seafloor infrastructures and generate devastating tsunamis. In spite of decades of research into the functioning of submarine landslides there are still numerous open questions, in particular how different phases of sliding influence each other. Here, we re-analyze Ana Slide—a relatively small (<1 km3) landslide offshore the Balearic Islands, which is unique in the published literature because it is completely imaged by high-resolution 3D reflection seismic data. Ana Slide comprises three domains: (a) a source area that is almost completely evacuated with evidence of headscarp retrogression, (b) an adjacent downslope translational domain representing a by-pass zone for the material that was mobilized in the source area, and (c) the deposit formed by the mobilized material, which accumulated downslope in a sink area and deformed slope sediment. Isochron maps show deep chaotic seismic units underneath the thickest deposits. We infer that the rapid deposition of the landslide material deformed the underlying sediments. A thin stratified sediment unit between three lobes suggests that Ana Slide evolved in two failure stages separated by several tens of thousands of years. This illustrates the problem of over-estimating the volume of mobilized material and under-estimating the complexity even of relatively simple slope failures without high-quality 3D reflection seismic data.
Subjects
emplacement mechanism
kinematic analysis
Mediterranean Sea
submarine landslide
substrate deformation processes
DDC Class
550: Geowissenschaften
Publication version
publishedVersion
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Geochem Geophys Geosyst - 2022 - Sager - Development and Emplacement of Ana Slide Eivissa Channel Western Mediterranean.pdf
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