地质学
山崩
海底滑坡
构造学
被动保证金
活断层
潜艇
地震学
分布(数学)
地貌学
海洋学
裂谷
数学
数学分析
作者
Sally Watson,Joshu Mountjoy,Gareth Crutchley
出处
期刊:Geological Society, London, Special Publications
[Geological Society of London]
日期:2020-01-01
卷期号:500 (1): 477-494
被引量:23
标识
DOI:10.1144/sp500-2019-165
摘要
Abstract Submarine landslides occur on continental margins globally and can have devastating consequences for marine habitats, offshore infrastructure and coastal communities due to potential tsunamigenesis. Therefore, understanding landslide magnitude and distribution is central to marine and coastal hazard planning. We present the first submarine landslide database for the eastern margin of New Zealand comprising >2200 landslides occurring in water depths from c. 300–4000 m. Landslides are more prevalent and, on average, larger on the active margin compared with the passive margin. We attribute higher concentrations of landslides on the active margin to tectonic processes including uplift and oversteepening, faulting and seamount subduction. Submarine landslide scars are concentrated around canyon systems and close to canyon thalwegs. This suggests that not only does mass wasting play a major role in canyon evolution, but also that canyon-forming processes may provide preconditioning factors for slope failure. Results of this study offer unique insights into the spatial distribution, magnitude and morphology of submarine landslides across different geological settings, providing a better understanding of the causative factors for mass wasting in New Zealand and around the world.
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