A Study of New Concepts in Stick-Slip Behavior

这项研究被设计为对这一假设的严格检验，即在实验室中，法向应力的变化是控制粘滑行为的主要因素。这一假说是由最近关于泡沫橡胶粘滑行为的工作提出的，如果是真的，将对目前关于破裂成核和前兆滑移特征的观点产生重大影响。粘滑过程中法向应力变化的存在对断裂力学、断层行为和短期地震预报具有重要意义。可以对在涉及正常运动的滑动事件期间记录的地震波谱进行估计；这些估计将与实际的泡沫橡胶粘滑数据进行比较，以评估是否发生了正常运动。这项工作是国家减少地震灾害计划的一部分。

This research is designed as a rigorous test of the hypothesis that variations in normal stress are a primary factor controlling stick-slip behavior in the laboratory. The hypothesis has been suggested by recent work on stick-slip behavior in foam rubber, and, if true, will have a major impact on current ideas about rupture nucleation and the characteristics of premonitory slip. The existence of normal stress variations during stick-slip has implications for rupture mechanics, fault behavior, and short- term earthquake prediction. Estimates can be made about the spectra of seismic waves recorded during a slip event which involves normal motions; these estimates will be compared with the actual foam rubber stick-slip data in order to assess whether normal motions have occurred. This work is a component of the National Earthquake Hazard Reduction Program.