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: 2020059
• 负责人: Demian Saffer
• 金额: $ 11.84万
• 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: 2019
• 资助国家: 美国
• 起止时间: 2019-11-15 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2020059&HistoricalAwards=false
• 关键词: Collaborative; Research; Controls; along; strike

The physical processes dictating the spectrum of fault slip modes (spanning destructive earthquakesto slow slip events and aseismic creep) and the links between these behaviors and long-termmorphotectonic evolution of subduction systems are not understood. There is a fundamentalneed to address this important problem with an integrated, system-level approach combininggeodynamical modeling with high-quality geophysical and geological constraints on subductionmargin 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-slipin the south to aseismic creep in the northern North Island, and where a wide range of subduction-relatedprocesses and characteristics vary along-strike. The aim is to rigorously investigate the feedbacksbetween 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.

决定断层滑动模式范围（从破坏性地震到慢滑动事件和地震蠕变）的物理过程以及这些行为与俯冲系统长期形态构造演化之间的联系尚不清楚。迫切需要通过综合的系统级方法来解决这一重要问题，将地球动力学建模与俯冲边缘特征的高质量地球物理和地质约束相结合。该项目将开展一项跨学科、跨国合作计划，涉及美国、新西兰、日本和英国评估对控制俯冲带滑移行为和长期变形过程的系统级控制。重点是新西兰的 Hikurangi 边缘，GPS 数据显示滑移行为从南部以粘滑为主到北岛北部的地震蠕变发生了转变，并且那里广泛的俯冲相关过程和特征沿不同方向变化。罢工。目的是严格研究板块界面滑移行为、固体和流体质量通量以及长期地质记录中板块边界力学表现之间的反馈，这些反馈可能反映了连接弧前隆起、沉积物转移和底侵、板块边界强度的常见驱动过程和地震发生。首席研究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建模来重点关注。