Deep-seated rockslide-avalanches preceded by mass rock creep of sedimentary rocks in the Akaishi Mountains, central Japan
Deep-seated rockslide-avalanches preceded by mass rock creep of sedimentary rocks in the Akaishi Mountains, central Japan
复制标题
日本中部赤石山脉的沉积岩发生大规模岩石蠕变，发生深部岩石滑坡雪崩
DOI：
10.1016/0013-7952(94)90039-6
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发表时间：
1994
影响因子：
7.4
通讯作者：
K. Kiho
中科院分区：
文献类型：
--
作者：
M. Chigira;K. Kiho
在日本已知有七次大型的沉积岩崩塌。几乎所有这些主要的滑坡之前，岩石的重力变形（质量岩石蠕变，MRC），推断从地质和地貌调查的5个岩崩在赤石山。在赤石山脉的岩滑-雪崩之前的MRC的特征是陡峭倾斜叶理的缓慢但稳定的下坡弯曲，伴随着强烈的变形和岩体的剪切沿着叶理的破碎。岩体的这种变形和破碎是发生岩滑-雪崩的基本原因，岩滑-雪崩发生在蠕动的岩体由于水流侵蚀而失去斜坡下部的支撑时。这种类型的MRC在一部分蠕动区滑动后持续很长一段时间，并导致岩滑雪崩的滑坡烧灼物长期产生碎屑。
Seven large rockslide-avalanches of sedimentary rocks are known in Japan. Almost all of these major landslides were preceded by gravitational deformation of rocks (mass rock creep, MRC), as inferred from geologic and geomorphic investigations of five rockslide-avalanches in the Akaishi Mountains. The MRC that preceded the rockslide-avalanches in the Akaishi Mountains was characterized by a slow but steady downslope bowing of steeply dipping foliations, which accompanied intensive deformation and fragmentation of the rock mass by shearing along foliations. This deformation and fragmentation of the rock mass provides a basic cause for the occurrence of rockslide-avalanches, which occur when a creeping rock mass has lost its support from the lower part of a slope by stream erosion. This type of MRC continues for a long time after a part of the creeping area has slid and results in longterm generation of debris by the landslide sear of the rockslide-avalanche.