MARGINS/GeoPRISMS Post-Doctoral Fellowship Research: Evolution of Sediment Physical Properties in the Nankai Subduction Zone and Implications for the Updip Limit of Seismogenesis

MARGINS/GeoPRISMS 博士后研究：南开俯冲带沉积物物理性质的演化及其对地震发生上倾极限的影响

• 批准号: 1049591
• 负责人: Demian Saffer
• 金额: $ 16.59万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-03-01 至 2014-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1049591&HistoricalAwards=false
• 关键词: MARGINS; GeoPRISMS; Post; Doctoral; Fellowship

Abstract Funds are provided for a post-doctoral study of deformation and slip behaviors in subduction systems by an experimental approach combined with seismic data and microstructure observations. The PIs will conduct friction experiments on smectite and illite at elevated temperature and measure the acoustic wave velocities on sediment core samples at different stress states. Results of the friction experiments will be used to further test the hypothesis of smectite-illite transition for updip limits of seismicity. The measurements of acoustic wave velocities at different stress states will allow the PIs to estimate the in-situ stress states and pore pressure in subduction systems by incorporating with seismic data. Samples and data from the IODP NanTroSEIZE transect area will be used to investigate the in situ stress and pore pressure conditions. Broader ImpactsThe award will support a young female researcher as a MARGINS/GeoPRISMS postdoctoral fellow. The proposed research aims to understand the evolution of slip behavior at the upper limit of the seismogenic zone and the deformation mechanisms in subduction zone fault systems and accretionary prisms. The focal points of the proposed study are also aligned with key questions of the Subduction Cycles and Deformation initiative within the new GeoPRISMS program. Understanding the mechanics and in situ conditions of faulting deformation at subduction plate boundaries has both scientific and social significance in terms of earthquake prediction and disaster prevention.

摘要 通过结合地震数据和微观结构观测的实验方法，为俯冲系统变形和滑移行为的博士后研究提供资金。 PI 将在高温下对蒙脱石和伊利石进行摩擦实验，并测量不同应力状态下沉积物岩心样品的声波速度。摩擦实验的结果将用于进一步检验地震活动上倾极限的蒙脱石-伊利石转变假设。不同应力状态下声波速度的测量将使 PI 能够结合地震数据来估计俯冲系统中的原地应力状态和孔隙压力。 IODP NanTroSEIZE 样线区域的样本和数据将用于研究原地应力和孔隙压力条件。 更广泛的影响该奖项将支持一位年轻的女性研究人员担任 MARGINS/GeoPRISMS 博士后研究员。本研究旨在了解孕震带上限滑动行为的演化以及俯冲带断层系统和增生棱柱的变形机制。拟议研究的重点也与新 GeoPRISMS 计划中俯冲循环和变形倡议的关键问题相一致。了解俯冲板块边界断层变形的机理和原地条件对于地震预报和防灾减灾具有重要的科学和社会意义。