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首页> 外文学位 >Geomorphology and failure mechanics of gigantic landslides within Summer Lake basin: Implications for seismogenic triggers, Lake County, Oregon.
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Geomorphology and failure mechanics of gigantic landslides within Summer Lake basin: Implications for seismogenic triggers, Lake County, Oregon.

机译：夏季湖盆内巨大滑坡的地貌学和破坏机制：对俄勒冈州莱克县的地震成因的启示。

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摘要

Summer Lake basin is located in south-central Oregon in the northwestern Basin and Range. The 40 km-long, Winter Ridge-Slide Mountain (WR-SM) escarpment that bounds the basin on the west and south, respectively, exposes a kilometer-thick, Neogene sequence of dense volcanic flow rocks overlying very weak tuffaceous sedimentary rocks that dip 10° west. Gigantic landslides scallop the southwestern escarpment and display several kilometer long runouts characteristic of rock avalanches. Geotechnical rock mass characterization and slope stability analyses confirm observations that these landslides generally initiate along shallow, east-dipping, planar failure surfaces within the weak tuffaceous sedimentary rocks, are insensitive to groundwater fluctuations, and are stable under static conditions. Pseudo-static analyses reveal that strong shaking (>1 g), resulting from Quaternary dip-slip movement on the WR-SM fault, is required to trigger landsliding. Shaking is also responsible for initiating large flow slides within Quaternary deposits along the base of the escarpment.
机译：萨默湖盆地位于俄勒冈州中南部的西北盆地和山脉。 40公里长的温特里奇滑坡（WR-SM）陡坡分别限制了盆地的西部和南部，暴露出一千米厚的新近纪序列的致密火山流岩，其上覆着很弱的凝灰岩沉积岩，向西10°。巨大的滑坡在西南悬崖上形成扇贝形，并具有几公里长的岩石崩塌特征。岩土工程质量表征和边坡稳定性分析证实了以下观察：这些滑坡通常是在软质凝灰岩沉积岩中的浅，东倾，平面破坏面上引发的，对地下水波动不敏感，并且在静态条件下稳定。拟静力分析表明，由WR-SM断层的第四纪倾滑运动引起的强烈震动（> 1 g）需要触发滑坡。振动还负责引发沿着悬崖底部的第四纪沉积物中的大流动滑坡。

著录项

  • 作者

    Badger, Thomas Clark.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Geology.; Geotechnology.
  • 学位 M.S.
  • 年度 2002
  • 页码 96 p.
  • 总页数 96
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地质学;地质学;
  • 关键词

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