Field and laboratory studies of ductile strain localization on different length scales

岩石的有限应变在不同的尺度上有局部化，从粒内尺度到板块边界尺度。事实上，地球岩石圈的板块分割是应变局部化的直接表现。多年来，与应变局部化有关的几个问题一直困扰着地球科学家和材料科学家：(1)什么过程决定了局部化的长度和时间尺度？局部化如何影响材料的整体力学性能？一旦建立了应变局部化模式，这些模式在持续应变下的稳定性如何？这些问题不仅仅是学术上的兴趣，而且与工业社会有着更广泛的相关性，因为本地化与地震和工程材料的机械不稳定等多种现象有关。为了回答这些问题，我们提出了一个结合现场和实验室计划. ...该项目的首要目标是建立应变局部化模式的尺度参数，并确定这些模式在时间和空间上的演变过程。如果要在造山带、裂谷的地球动力学建模或地震活动性的确定性建模中取得任何进展，就需要这些标度参数。

Finite strain in rocks is localized on different scales, from the intragranular scale to the scale of plate boundaries. In fact, the segmentation of the Earth's lithosphere into plates is a direct manifestation of strain localization. Over the years, several questions related to strain localization have vexed both earth scientists and materials scientists: (1) What processes govern the length- and time-scales of localization? How does localization affect the bulk mechanical properties of materials? Once strain localization patterns are established, how stable are these patterns with continued strain? These questions are not merely of academic interest, but have broader relevance for industrial society, as localization is tied to such diverse phenomena as earthquakes and mechanical instability of enigneering materials. To answer these questions, we propose a combined field and laboratory program. ... The overriding goal of the project is to establish scaling parameters for strain localization patterns, and to determine the processes underlying the evolution of these patterns in time and space. Such scaling parameters are required if there is to be any progress in geodynamic modeling of orogneses, rifting, or in deterministic modeling of seismicity.