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.

合作研究：控制沿走向变化锁定和蠕动的巨型逆冲断层行为在Hikurangi收敛marginThe物理过程决定了频谱的断层滑动模式（跨越破坏性地震的缓慢滑动事件和地震蠕变）和这些行为之间的联系和长期的形态构造演化的俯冲系统还不清楚。有一个基本的需要，以解决这一重要问题的综合，系统级的方法相结合的地球动力学建模与高质量的地球物理和地质约束的俯冲边缘的特点。日本和英国评估对俯冲带滑动行为和长期变形过程的系统级控制。重点是在新西兰的Hikurangi边缘，GPS数据显示，在滑动行为从主要粘滑在南部的过渡到在北方北岛的aseprocket蠕变，并在广泛的俯冲相关的过程和特点变化沿走向。其目的是严格调查板块界面滑动行为，固体和流体质量通量之间的反馈，以及长期地质记录中板块边界力学的表现形式，这些地质记录可能反映了连接弧前隆起，沉积物转移和底侵，板块边界强度和地震成因的共同驱动过程。首席调查员将通过一种综合方法解决这一重要问题，该方法将大规模地震成像、古地震学和地貌学结合起来，并通过最先进的数字建模的透镜进行重点研究。