Effects of Humidity, Shear Stress, and Strain Rate Localization on Fault Healing and Friction

湿度、剪应力和应变率定位对断层愈合和摩擦的影响

• 批准号: 0001215
• 负责人: Chris Marone
• 金额: --
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-15 至 2001-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0001215&HistoricalAwards=false
• 关键词: Effects; Humidity; Shear; Stress; Strain

Marone EAR-0001215 The seismic cycle requires that faults re-strengthen between earthquakes. Frictional healing (as evidenced by increasing static friction during quasi-stationary contact) is considered the most likely mechanism of interseismic strength recovery. However, the mechanisms of frictional healing are poorly understood. This proposal is to study the physical and chemical mechanisms of fault healing and frictional aging in simulated granular fault gouge. The results of the experiments will have significant implications for understanding the distinction between time- and slip-dependent friction evolution. Recent theoretical studies of dynamic rupture indicate that this distinction plays a key role in determining seismic characteristics such as frequency-magnitude scaling and the mode of rupture expansion (as a classical, self-similar crack or a self-healing slip pulse). Thus, the results will connect in an important way to other studies of earthquake source physics including theoretically-based studies and those based on field observations.

Marone Ear-0001215地震循环要求在地震之间重新强度的断层。摩擦愈合（如准平台接触期间的静态摩擦增加所证明的）被认为是经过震撼力恢复的最可能机理。但是，摩擦愈合的机制知之甚少。该建议是研究模拟颗粒断层孔中断层愈合和摩擦衰老的物理和化学机制。实验的结果将对理解时间和滑移依赖性摩擦演化之间的区别具有重要意义。动态破裂的最新理论研究表明，这种区别在确定地震特征（例如频率标度尺度和破裂膨胀方式（作为经典的，自相似的裂纹或自我修复滑移脉冲）中起着关键作用。因此，结果将以重要的方式与其他地震源物理学的研究联系起来，包括基于理论的研究以及基于现场观察的研究。