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    Causes and triggers of deep-seated hillslope instability in the tropics - Insights from a 60-year record of Ikoma landslide (DR Congo)

    Authors
    Dille, A.
    Kervyn, F.
    Bibentyo, T.M.
    Delvaux, D.
    Ganza, G.B.
    Mawe, G.I.
    Buzera, C.K.
    Nakito, E.S.
    Moeyersons, J.
    Monsieurs, E.
    Nzolang, C.
    Smets, B.
    Kervyn, M.
    Dewitte, O.
    Show allShow less
    Discipline
    Earth and related Environmental sciences
    Subject
    Geodynamics and mineral resources
    Natural hazards
    Audience
    Scientific
    Date
    2019
    Metadata
    Show full item record
    Description
    Studying the causes and triggers of landslides is essential to understand the key process of hill slope evolution and the hazards they generate. Such understanding is crucial in tropical areas where landslide impacts are high and on the rise, and the dearth of accurate processes characterisation is large. Here we investigate the timing and the mechanisms of relatively slow-moving deep-seated landslides in weathered tropical environments through the analysis of a landslide located in the Kivu Rift (DR Congo). This landslide, developed in weathered basalt, shows obvious deformation features at its surface indicating large deformations during recent years, making it a unique natural laboratory in an underexplored area. High-resolution topographic data, historical aerial photographs, satellite imagery and careful field investigations are used to detail the landslide mechanisms and investigate failure development over a 60-year record. By confronting rainfall time series and earthquake sequences with the different deformation episodes,we show that the relation between instability triggers and slope failure is not straightforward; e.g., the largest instability occurred at the end of a dry season during a period of relatively low seismicity. Instead of direct influence of external triggers, we show that some phases of instability may be caused by the intrinsic evolution of the hillslope associated with weathered-related weakening of the slope strength through time. Our results question the relative weight of the commonly recognized causes and triggers of slope instability in this area. Analysis of landslide causes and triggers provided here should help improve the understanding of how surface processes influence the pace of hillslope evolution. It also contributes to a more accurate evaluation of the landslide hazard in the area and across other regions where similar environmental conditions are met.
    Citation
    Dille, A.; Kervyn, F.; Bibentyo, T.M.; Delvaux, D.; Ganza, G.B.; Mawe, G.I.; Buzera, C.K.; Nakito, E.S.; Moeyersons, J.; Monsieurs, E.; Nzolang, C.; Smets, B.; Kervyn, M.; Dewitte, O. (2019). Causes and triggers of deep-seated hillslope instability in the tropics - Insights from a 60-year record of Ikoma landslide (DR Congo). , Geomorphology, Vol. 345, 106835, DOI: 10.1016/j.geomorph.2019.106835.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/12360
    doi: http://dx.doi.org/10.1016/j.geomorph.2019.106835
    url: https://www.sciencedirect.com/science/article/abs/pii/S0169555X19303071
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
    Links
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