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

合作研究：控制希库朗吉会聚边缘锁定和蠕动巨型逆冲行为的沿走向变化

• 批准号: 1615815
• 负责人: Harm Van Avendonk
• 金额: $ 105.26万
• 依托单位: University of Texas at Austin
• 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 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1615815&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Hikurangi会聚边缘锁定和蠕动的巨型逆冲行为的沿走向变化决定断层滑动模式(跨越破坏性地震到慢滑事件和无地震蠕动)的物理过程，以及这些行为与俯冲系统的长期地貌构造演化之间的联系尚不清楚。有必要通过一种综合的、系统级的方法来解决这一重要问题，该方法将地球动力学模拟与对俯冲边缘特征的高质量地球物理和地质约束相结合。该项目将实施一个涉及美国、新西兰、日本和英国的跨学科、多国合作计划，以评估对控制俯冲带滑动行为和长期变形的过程的系统级控制。焦点集中在新西兰的Hikurangi边缘，那里的GPS数据显示，滑动行为从南部的粘滑为主过渡到北部的无地震蠕动，那里与俯冲相关的广泛过程和特征在走向上有所不同。其目的是严格研究板块界面滑移行为、固体和流体质量通量之间的反馈，以及板块边界力学在长期地质记录中的表现，这些可能反映了弧前隆升、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。首席研究人员将通过结合大规模地震成像、古地震学和地貌学的综合方法来解决这一重要问题，并通过最先进的数值模拟的镜头进行重点关注。