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

这项工作的主要目的是确定俯冲带沉积物的物理性质。来自南开海槽和苏门答腊和阿留申海沟的沉积物实验将在德克萨斯A M大学的岩石力学实验室进行。这些实验将在高压和高温条件下进行，以模拟沉积物在一个构造板块沉入另一个构造板块之下时被带到地球深处时所遇到的条件。该项目的结果将有助于了解断层滑动和全球俯冲带产生海啸的潜力。该项目将支持一名早期职业女性研究员担任GeoPRISMS博士后研究员。该研究旨在了解俯冲带浅部的变形行为，那里可能发生更大的位移和地面变形，以应对巨型逆冲断层地震破裂。该项目将解决有关俯冲带的浅近海沟部分是否被锁定和积累应变或完全蠕动的关键基本问题。固结和蠕变实验将在升高的压力和温度下进行，并在一系列的应变率对沉积物样品从三个不同的俯冲系统-南海海槽，苏门答腊岛，阿留申俯冲带。该项目的研究目标是：1）表征作为压力、温度、应变率和沉积物岩性的函数的弹性、塑性和粘性变形行为; 2）评估俯冲带浅近海沟区域应变积累和同震滑动破裂传播的潜力。该项目将提高对俯冲带的应变积累、断层耦合和滑动行为的认识。

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.