Collaborative Research: Structural Architecture and Evolutionary Plate-Boundary Processes along the San Jacinto Fault Zone

合作研究：圣哈辛托断裂带沿线的结构体系和演化板块边界过程

• 批准号: 0908042
• 负责人: Frank Vernon
• 金额: $ 94.13万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0908042&HistoricalAwards=false
• 关键词: Collaborative; Research; Structural; Architecture; Evolutionary

Understanding earthquake physics is a critical step on the road to forecasting the short-term behavior of faults with obvious consequences for hazard mitigation. This is a project whose goal is to examine the dynamics associated with earthquake rupture. The studies to be carried out will provide much more comprehensive constraints on the way that a major fault zone behaves. Specifically, the project will combine detailed imaging of the San Jacinto Fault (SJF) in Southern California using an array to characterize the fault zone in the subsurface. It will couple this with surface outcrop and mapping of the fault zone, paleoseismic analysis, GPS analysis of crustal deformation, and theoretical work on seismic propagation to understand how factors such as fault damage, juxtaposition of different rock types, and segmentation affect the behavior of the fault zone. The Principal Investigators bring together current ideas about the rupture process and outline an approach that may be able to provide a quantitative understanding of the evolution of fault zone structures and related deformation phenomena (seismicity, strain fields) in actively deforming regions. This approach requires a framework that accounts for faults with evolving geometrical and material properties, as well as time-dependent interactions between the seismogenic zone and underlying viscoelastic substrate.

了解地震物理是预测断层短期行为的关键一步，这对减轻灾害具有明显的影响。该项目的目标是研究与地震破裂相关的动力学。即将进行的研究将为主要断裂带的行为方式提供更全面的约束。具体来说，该项目将使用阵列结合南加州圣哈辛托断层（SJF）的详细成像来表征地下断层带。它将与地表露头和断层带绘图、古地震分析、地壳变形 GPS 分析以及地震传播理论工作相结合，以了解断层损伤、不同岩石类型的并置和分段等因素如何影响断层带的行为。首席研究员汇集了有关破裂过程的当前想法，并概述了一种方法，该方法可能能够定量了解活跃变形区域中断层带结构的演化和相关变形现象（地震活动、应变场）。这种方法需要一个框架来解释具有不断变化的几何和材料特性的断层，以及地震发生带和下面的粘弹性基质之间依赖于时间的相互作用。