EAGER: Reconstructing the Seismic History of the Teton Fault Using Lake Sediments at Grand Teton National Park, WY

EAGER：利用怀俄明州大提顿国家公园的湖泊沉积物重建提顿断层的地震历史

• 批准号: 1546677
• 负责人: Mark Abbott
• 金额: $ 4.22万
• 依托单位: University of Pittsburgh
• 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: 2015-11-01 至 2017-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1546677&HistoricalAwards=false
• 关键词: EAGER; Reconstructing; Seismic; History; Teton

AbstractA non-technical description of the project, which explains the project's significance and importanceThe spectacular scenery of Grand Teton National Park is largely the result of movement along the Teton Fault, which is still active today. Numerous lake basins populate the mountain front and earthquakes resulting from fault movement produce landslides that accumulate distinctive sediment layers on the lake floor. This project will investigate these sediments in order to determine the characteristics of the layers resulting from fault movement and to calculate the recurrence interval of earthquakes in the Grand Teton region over the past 15,000 years. In addition to developing methods for the long-standing problem of identifying the tectonic influences upon sediment deposition, this research will help Grand Teton National Park evaluate earthquake hazards and provide the basis for an educational program for park visitors. A technical description of the projectThis EAGER project will employ a comprehensive suite of well-established methods to investigate this distinctive geologic setting, where past tectonic activity is unusually well preserved in lake sediments. Multi-beam sonar bathymetric mapping, seismic surveys, and sediment cores from multiple lakes located directly on the Teton fault will be evaluated to produce: i) a high-resolution (centimeter-scale) bathymetric map of lake-floor morphology; ii) an inventory of landslide deposits and slope failures preserved in multiple basins positioned along the Teton fault trace; and iii) a continuous and accurately dated 15,000-year-long record of earthquakes and earthquake-driven disturbances at Grand Teton National Park. The paleoseismic record generated through this research is a key initial step toward developing a solid understanding of interactions among tectonic, climatic, and geomorphic processes, including their relative roles in driving landscape evolution. The results will also contribute to the development of a promising method for constructing paleoseismic records from lake sediments.

该项目的Abstracta非技术描述解释了该项目的意义和重要的大提顿国家公园的壮观风景，这在很大程度上是沿着Teton断层运动的结果，这仍然很活跃。由于断层移动而导致的山地和地震遍布山地滑坡，从而产生了山地滑坡，这些湖面在湖面上积聚了独特的沉积物层。该项目将研究这些沉积物，以确定故障运动导致的层的特征，并计算过去15，000年中大提顿地区地震的复发区间。除了开发用于确定构造对沉积物沉积影响的长期存在的方法外，这项研究还将帮助大提顿国家公园评估地震危害，并为公园游客提供教育计划的基础。该项目的急切项目的技术描述将采用一系列综合建立的方法来研究这种独特的地质环境，在这种地质环境中，过去的构造活动在湖泊沉积物中普遍保存得很好。将评估来自TETON断层上多个湖泊的多光声声音测图，地震调查和沉积物核心，以产生：i）湖地板形态的高分辨率（厘米尺度）测深图； ii）沿着沿着提顿断层痕迹位于多个盆地保存的滑坡沉积物和斜率故障的清单； iii）在大提顿国家公园（Grand Teton National Park）的地震和地震驱动障碍的持续且准确的历史记录为15，000年。通过这项研究产生的旧记录是迈出对构造，气候和地貌过程之间相互作用的扎实相互作用的关键第一步，包括它们在驱动景观演化中的相对作用。结果还将有助于开发一种有前途的方法，用于从湖泊沉积物中构建旧记录。