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  • Springer Science and Business Media LLC  (4)
  • 2020-2024  (4)
  • 1
    Online Resource
    Online Resource
    Geotechnical characterization and stability analysis of subaqueous slopes in Lake Lucerne (Switzerland)
    Springer Science and Business Media LLC ; 2022
    In:  Natural Hazards Vol. 113, No. 1 ( 2022-08), p. 475-505
    Details
    In: Natural Hazards, Springer Science and Business Media LLC, Vol. 113, No. 1 ( 2022-08), p. 475-505
    Abstract: Tsunamis occur not only in marine settings but also in lacustrine environments. Most of the lacustrine tsunamis are caused by seismically- or aseismically-triggered mass movements. Therefore, an assessment of the stability of subaqueous slopes is crucial for tsunami hazard assessment in a lake. We selected Lake Lucerne (Switzerland) as a natural laboratory to perform an in-depth geotechnical characterization of its subaqueous slopes. This lake experienced documented tsunamis in 1601 and 1687. Some of its slopes still bear sediment volumes with a potential for tsunamigenic failure. To identify such slopes, we interpreted available reflection seismic data and analyzed the bathymetric map. Then, we performed 152 dynamic Cone Penetration Tests with pore pressure measurement (CPTu) and retrieved 49 sediment cores at different locations in the lake. These data were used to characterize the failure-prone sediments and to evaluate the present-day static stability of subaqueous slopes. Obtained results allowed the definition of three classes of slopes in terms of static stability: unstable slopes, stable slopes close to the unstable state, and stable areas. Non-deltaic slopes with thicker unconsolidated fine-grained sediment drape and moderate-to-high slope gradients ( 〉  5–10°) have the lowest Factor of Safety. In agreement with previous studies, the failure plane for the non-deltaic slopes is embedded within the fine-grained glaciolacustrine sediments. Deltaic slopes with prevailing coarse-grained sediments mostly appear statically stable. Finally, we generalized the measured undrained shear strength profiles $${s}_{u}(z)$$ s u ( z ) into the depth-dependent power-law models. These models define the $${s}_{u}$$ s u of Lake Lucerne’s sediments and can be applied to other lakes with similar sedimentation history.
    Type of Medium: Online Resource
    ISSN: 0921-030X , 1573-0840
    URL: Article
    DOI: 10.1007/s11069-022-05310-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2017806-2
    SSG: 14
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  • 2
    Online Resource
    Online Resource
    Rapid transition of sediment consolidation across an expanding mangrove fringe in the Firth of Thames New Zealand
    Springer Science and Business Media LLC ; 2020
    In:  Geo-Marine Letters Vol. 40, No. 2 ( 2020-04), p. 295-308
    Details
    In: Geo-Marine Letters, Springer Science and Business Media LLC, Vol. 40, No. 2 ( 2020-04), p. 295-308
    Type of Medium: Online Resource
    ISSN: 0276-0460 , 1432-1157
    URL: Article
    DOI: 10.1007/s00367-019-00589-9
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2020
    detail.hit.zdb_id: 1481423-7
    detail.hit.zdb_id: 381526-2
    SSG: 13
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  • 3
    Online Resource
    Online Resource
    Weakening behavior of the shallow megasplay fault in the Nankai subduction zone
    Springer Science and Business Media LLC ; 2022
    In:  Earth, Planets and Space Vol. 74, No. 1 ( 2022-11-04)
    Details
    In: Earth, Planets and Space, Springer Science and Business Media LLC, Vol. 74, No. 1 ( 2022-11-04)
    Abstract: The Nankai Trough megasplay fault hosts diverse modes of fault slip, ranging from slow slip events to megathrust earthquakes, and is responsible for related phenomena such as tsunamis and submarine landslides. All types of slip events require some kind of frictional weakening process in order to nucleate and propagate. We tested fluid-saturated, powdered megasplay fault samples in a direct shear apparatus under effective normal stresses of 2–18 MPa to investigate their friction velocity- and slip-dependence. The experiments show that for short distances (1 mm) after a velocity step, there is an evolution from velocity weakening at low effective normal stress to velocity strengthening at high effective normal stresses. Over a longer distance (5 mm), large velocity weakening is observed over all tested effective normal stresses. In all experiments, slip weakening behavior occurred with relatively large weakening rates at low effective normal stresses and smaller weakening rates at higher effective normal stresses. Critical stiffnesses for slip instability were calculated for both the velocity and slip dependence of friction to determine their relative importance. At shallow depths, velocity weakening would be the main cause of frictional instability for both small and large slip perturbations, whereas at greater depth instability requires either slip weakening over small slip distances, or velocity weakening induced by larger slip. Regardless of the underlying mechanism, the observed slip instability at lower effective stresses increases the likelihood for fault slip events to travel to the seafloor which may cause submarine landslides and tsunamis. Graphical Abstract
    Type of Medium: Online Resource
    ISSN: 1880-5981
    URL: Article
    DOI: 10.1186/s40623-022-01728-w
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2087663-4
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  • 4
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    Online Resource
    On the consolidation state of sediments from the accretionary prism offshore Vancouver Island, North Cascadia Margin
    Springer Science and Business Media LLC ; 2022
    In:  Marine Geophysical Research Vol. 43, No. 2 ( 2022-06)
    Details
    In: Marine Geophysical Research, Springer Science and Business Media LLC, Vol. 43, No. 2 ( 2022-06)
    Abstract: Sediment geotechnical properties are an important component of geohazard analyses and studies on submarine slope failures on continental margins. The northern Cascadia margin is a region of repeated subduction earthquakes and related geohazards including devastating tsunamis. Despite several drilling campaigns at this margin mostly for gas hydrate studies, sediment geotechnical properties are lacking to date. We therefore investigated a set of 20 half-round samples from four drill sites of Integrated Ocean Drilling Program (IODP) Expedition 311 along a margin-perpendicular transect. Samples were analysed for Atterberg properties (liquid limit, plasticity limit, plasticity index) and consolidation state (pre-consolidation stress, over-consolidation ratio, initial void ratio and compression index). Results of these parameters are in good agreement with similar studies at the southern Cascadia margin from Ocean Drilling Program (ODP) Leg 204 and are regarded robust, despite the long time-span between sample recovery in 2005 and our analyses. Individual results are interpreted at each of the drill sites and reflect the overall tectonic state of the location within the accretionary prism. An interplay of site-specific tectonic forcing, including thrust faulting, uplift, folding, and erosion appears to govern the depth-dependent consolidation state of the sediments.
    Type of Medium: Online Resource
    ISSN: 0025-3235 , 1573-0581
    URL: Article
    DOI: 10.1007/s11001-022-09487-9
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 414196-9
    detail.hit.zdb_id: 1478200-5
    SSG: 16,13
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