Collaborative Research: Controls on along-strike variations in locked and creeping megathrust behavior at the Hikuran convergent margin

合作研究：控制希库兰会聚边缘锁定和蠕动巨型逆冲行为的沿走向变化

• 批准号: 1616847
• 负责人: David Okaya
• 金额: $ 88.9万
• 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: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1616847&HistoricalAwards=false
• 关键词: Collaborative; Research; Controls; along; strike

Collaborative Research: Controls on along-strike variations in locked and creeping megathrust behavior at the Hikurangi convergent marginThe physical processes dictating the spectrum of fault slip modes (spanning destructive earthquakes to slow slip events and aseismic creep) and the links between these behaviors and long-term morphotectonic evolution of subduction systems are not understood. There is a fundamental need to address this important problem with an integrated, system-level approach combining geodynamical modeling with high-quality geophysical and geological constraints on subduction margin characteristics.This project will conduct an interdisciplinary, multinational collaborative program involving the USA, New Zealand, Japan and the UK to evaluate system-level controls on processes that govern both slip behavior and long-term deformation at subduction zones. The focus is on the Hikurangi margin in New Zealand, where GPS data show a transition in slip behavior from predominantly stick-slip in the south to aseismic creep in the northern North Island, and where a wide range of subduction-related processes and characteristics vary along-strike. The aim is to rigorously investigate the feedbacks between plate interface slip behavior, solid and fluid mass fluxes, and manifestations of plate boundary mechanics in the long-term geological record that likely reflect common driving processes linking forearc uplift, sediment transfer and underplating, plate boundary strength, and seismogenesis. The Principal Investigators will address this important problem through an integrated approach combining large-scale seismic imaging, paleoseismology, and geomorphology, focused through the lens of state-of-the-art numerical modelling.

协作研究：控制着锁定和爬行的巨大行为的控制，在hikurangi融合缘缘缘缘缘缘界，这决定了故障滑移模式的频谱（跨越破坏性地震到缓慢的滑移事件和无性敏锐的蠕变），以及这些行为和长期的形式之间的联系和长期的形式的链接，而不是s s s s s s s s s子的理解。有一种基本需求，通过一种集成的系统级别方法来解决这个重要问题，将地球动力学建模与高质量的地球物理和地质限制结合了俯冲贷款特征的高质量和地质限制。该项目将进行跨学科的跨国合作计划，涉及美国，新西兰，日本，日本，日本和英国的群体群体群体的行为，并在整个过程中进行了行为，并在整个过程中进行了统治。重点是新西兰的Hikurangi余量，在那里，GPS数据显示了从南部的主要滑落到北部北部岛上的Aseismic蠕变的滑移行为的过渡，在那里，与俯冲相关的过程和特性都随着撞击而变化。目的是严格研究板界面滑动行为，固体和流体质量通量和板边界机械师在长期地质记录中的表现之间的反馈，该记录可能反映了连接前提升高，沉积物传递和底盘底板边界强度和地震生成的常见驾驶过程。主要研究人员将通过结合大规模地震成像，古介质学和地貌学的综合方法来解决这个重要问题，该方法集中在最先进的数值建模范围内。