Geological structures precondition hillslope stability as well as the processes and landslide mechanisms which develop in response to deglaciation. In areas experiencing glacier retreat and debuttressing, identifying landslide preconditions is fundamental for anticipating landslide development. Herein, the ~ 150 M m 3 Mueller Rockslide in Aoraki/Mount Cook National Park, New Zealand, is described; and we document how preconditions have controlled its morphology and development in response to thinning of the adjacent Mueller Glacier. A combination of geomorphological and geotechnical mapping—based on field, geophysical and remote sensing data—was used to characterise the rock mass and morphology of the rockslide and surrounding hillslope. Mueller Rockslide is identified as a rock compound slide, undergoing dominantly translational failure on a dip slope. The crown of the rockslide is bounded by several discontinuous, stepped scarps whose orientation is controlled by joint sets; these scarps form a zone of toppling that is delivering rock debris to the main rockslide body. Surface and subsurface discontinuity mapping above the crown identified numerous joints, fractures and several scarps that may facilitate continued retrogressive enlargement of the rockslide. The presence of lateral release structures, debuttressing of the rockslide toe and steeply dipping bedding suggest that the rockslide may be capable of evolving to a rapid failure.

中文翻译：

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新西兰南阿尔卑斯山活动性冰河滑坡的地貌和地质控制

地质结构为山坡稳定性以及响应冰川消退而发展的过程和滑坡机制提供了前提条件。在经历冰川退缩和初露的地区，确定滑坡先决条件是预测滑坡发展的基础。在此，描述了新西兰奥拉基/库克山国家公园的 ~ 150 M m 3 Mueller Rockslide；我们记录了先决条件如何控制其形态和发展以响应相邻的穆勒冰川变薄。结合基于实地、地球物理和遥感数据的地貌和岩土工程绘图，用于表征岩滑坡和周围山坡的岩体和形态。穆勒岩石滑坡被确定为岩石复合滑坡，在倾角上发生主要的平移失败。滑坡冠部由几个不连续的阶梯状陡坡包围，其方向受节理组控制；这些陡坡形成一个倾覆区，将岩石碎片输送到主滑坡体。冠部上方的地表和地下不连续性测绘确定了许多节理、裂缝和几个陡坡，这些可能有助于滑坡的持续倒退扩大。侧向释放结构的存在、滑坡趾部的出应力和陡倾层理表明，滑坡可能会演变为快速破坏。这些陡坡形成一个倾覆区，将岩石碎片输送到主滑坡体。冠部上方的地表和地下不连续性测绘确定了许多节理、裂缝和几个陡坡，这些可能有助于滑坡的持续倒退扩大。侧向释放结构的存在、滑坡趾部的出应力和陡倾层理表明，滑坡可能会演变为快速破坏。这些陡坡形成一个倾覆区，将岩石碎片输送到主滑坡体。冠部上方的地表和地下不连续性测绘确定了许多节理、裂缝和几个陡坡，这些可能有助于滑坡的持续倒退扩大。侧向释放结构的存在、滑坡趾部的出应力和陡倾层理表明，滑坡可能会演变为快速破坏。