Experimental investigations on the deformation behavior of sediment in the shallow region of the Nankai, North Sumatra, and Aleutian subduction zones

南海、北苏门答腊和阿留申俯冲带浅部沉积物变形行为的实验研究

• 批准号: 1654586
• 负责人: Hiroko Kitajima
• 金额: $ 23.45万
• 依托单位: Texas A&M University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-06-01 至 2020-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1654586&HistoricalAwards=false
• 关键词: Experimental; investigations; deformation; behavior; sediment

The main objective of the work is to characterize the physical properties of sediments at subduction zones. Experiments on sediments from the Nankai Trough and the Sumatra and Aleutians Trench will be conducted at the rock mechanics laboratory at Texas A&M University. The experiments will be run at high pressure and temperature conditions to simulate the conditions that the sediments encounter as they are carried deep into the earth as one tectonic plate plunges beneath another. The project results will aid in understanding slip on faults and the potential for tsunami generation at subduction zones worldwide. This project will support an early-career female researcher as a GeoPRISMS post-doctoral fellow.This research aims to understand deformation behavior in the shallow portion of subduction zones where greater displacement and ground deformation can occur in response to megathrust earthquake ruptures. This project will address key fundamental questions about whether the shallow near-trench portion of a subduction zone is locked and accumulating strain or fully creeping. Consolidation and creep experiments will be conducted at elevated pressures and temperatures and at a range of strain rates on sediment samples from three different subduction systems - Nankai Trough, Sumatra, and Aleutian subduction zones. The research goals of the project are to 1) characterize the elastic, plastic, and viscous deformation behaviors as a function of pressure, temperature, strain rate, and sediment lithology and 2) assess the potential for strain accumulation and co-seismic slip rupture propagation in the shallow near-trench regions of subduction zones. The project will advance knowledge of strain accumulation, fault coupling, and slip behavior at subduction zones.

这项工作的主要目的是表征俯冲区域沉积物的物理特性。对来自南京槽的沉积物以及苏门答腊和阿留申式沟渠的实验将在德克萨斯A＆M大学的岩石机械实验室进行。实验将在高压和温度条件下进行，以模拟沉积物在深处遇到的条件，因为一个构造板坠入另一个构造板。该项目的结果将有助于理解全球俯冲区域的断层和海啸产生的潜力。该项目将支持早期的女性研究人员作为博地学后研究员。这项研究旨在了解俯冲区浅层的变形行为，在俯冲区的浅层部分中，在响应于大型地震破裂的情况下可能会发生更大的位移和地面变形。该项目将解决有关俯冲带的浅水近处部分的关键基本问题，并积累了压力或完全爬行。合并和蠕变实验将在升高的压力和温度以及来自三个不同俯冲系统的沉积物样品的应变速率下进行 - 南卡槽，苏门答腊和阿留申俯冲带。该项目的研究目标是1）表征弹性，塑性和粘性变形行为是压力，温度，应变速率和沉积物岩性的函数，以及2）评估俯冲动物的浅层接近沟通区域中应变积累和共震动裂变的潜力。该项目将提高俯冲区域的应变积累，故障耦合和滑动行为的了解。