RAPID Collaborative Research: Landslides caused by the April 2015 Nepal earthquakes, from immediate hazard to tectonic driver

RAPID 合作研究：2015 年 4 月尼泊尔地震引起的山体滑坡，从直接危害到构造驱动因素

• 批准号: 1546630
• 负责人: A Joshua West
• 金额: $ 5.27万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1546630&HistoricalAwards=false
• 关键词: RAPID; Collaborative; Research; Landslides; caused

A non-technical description of the project, which explains the project's significance and importanceLandslides are a continual threat in many mountainous regions of the world and the danger is increased in areas prone to large earthquakes. In spite of this association, knowledge concerning the extent to which seismic events can trigger landslides is rudimentary. This RAPID project will use satellite images to analyze the distribution of landslides following the large earthquake and aftershocks in Nepal of April, 2015. Field work will also be conducted by the research team to document the volume of material that has moved, evaluate the threat for subsequent remobilization of the landslides, and provide the evidence needed to more accurately predict the hazard level in other landslide-prone regions.A technical description of the projectThis RAPID project will (1) develop landslide maps from high resolution satellite imagery along the Himalaya and explore efforts to build high resolution Digital Elevation Models from before and after the earthquake; (2) characterize landslide geometries through field measurements and photogrammetric analysis, making it possible to rigorously determine landslide volumes; (3) develop and implement a sediment routing model to identify and monitor sediment transport; and (4) collect and analyze samples for baseline geochemical indexes that promise insight into erosion and sediment transport, with a priority on detrital cosmogenic beryllium isotopes and uranium-thorium/helium ratios, together with complementary efforts to monitor changes in river solute chemistry. Students will be actively engaged in all aspects of the research.

该项目的非技术描述解释了该项目的意义和重要的山脉滑坡是世界许多山区地区的持续威胁，并且在容易发生地震的地区，这种危险也会增加。尽管存在这种关联，但关于地震事件可能触发滑坡的程度的知识是基本的。这个快速项目将使用卫星图像分析2015年4月尼泊尔大地震和余震后的陆滑分布。研究团队还将进行现场工作，以记录已移动的材料数量，评估对陆地滑坡的威胁，并提供更准确的范围的范围，以预测其他范围的范围。 （1）从喜马拉雅山沿着高分辨率的卫星图像开发滑坡图，并探索从地震前后建立高分辨率数字高程模型的努力； （2）通过现场测量和摄影测量分析来表征滑坡几何形状，使得可以严格确定滑坡体积； （3）开发和实施沉积物路由模型以识别和监测沉积物的运输； （4）收集和分析样品的基线地球化学指数，该指数有望洞悉侵蚀和沉积物的运输，并优先考虑碎屑宇宙性铍同位素和铀硫/氦含量，以及互补的努力，以监测河流溶质化学变化的变化。学生将积极参与研究的各个方面。

项目成果

Landslide-driven drainage divide migration

• DOI: 10.1130/g39916.1
• 发表时间: 2018-05-01
• 期刊: GEOLOGY
• 影响因子: 5.8
• 作者: Dahlquist, Maxwell P.;West, A. Joshua;Li, Gen
• 通讯作者: Li, Gen

Observations of Landslides Caused by the April 2015 Gorkha, Nepal, Earthquake Based on Land, UAV, and Satellite Reconnaissance

• DOI: 10.1193/121616eqs237m
• 发表时间: 2017-12
• 期刊: Earthquake Spectra
• 影响因子: 5
• 作者: D. Zekkos;M. Clark;M. Whitworth;W. Greenwood;A. West;K. Roback;Gen K. Li;D. Chamlagain