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

了解地震物理学是在预测断层短期行为的道路上迈出的关键一步，对减灾具有明显的后果。这是一个项目，其目标是研究与地震破裂相关的动力学。即将开展的研究将对主要断裂带的行为方式提供更全面的约束。具体地说，该项目将结合南加州圣哈辛托断层(SJF)的详细成像，使用阵列来表征地下断裂带的特征。它将与断裂带的地表露头和测绘、古地震分析、地壳变形的GPS分析以及地震传播的理论工作结合起来，以了解断层破坏、不同岩石类型的并置和分段等因素如何影响断裂带的行为。首席研究人员汇集了关于破裂过程的现有观点，并概述了一种方法，该方法可能能够提供对活动变形区断裂带结构和相关变形现象(地震活动、应变场)演化的定量了解。这一方法需要一个框架来解释具有不断演变的几何和材料属性的断层，以及孕震带和下伏粘弹性基底之间的依赖时间的相互作用。

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.