A Renormalization Group Model for Observed Temporal Fluctuations in Regional Seismicity

区域地震活动观测时间波动的重正化群模型

• 批准号: 9508040
• 负责人: Charles Sammis
• 金额: $ 11.37万
• 依托单位: University of Southern California
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-07-15 至 1998-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9508040&HistoricalAwards=false
• 关键词: Renormalization; Group; Model; Observed; Temporal

9508040 SAMMIS This research is to test a theory of the process leading to earthquake failure in which a power law time-to-failure equation can be derived from renormalization group theory where the mainshock is viewed as a critical point. There is some evidence that the earthquake preparation process involves the collective behavior of a spatially extended regional fault network. For example, many large earthquakes are preceded by an increase in the number of intermediate sized events within a large region surrounding the main shock. The advantage of the renormalization group theory treatment is that the first order correction to scaling can be derived which takes the form of a periodic function of the logarithm of the time to failure, and which modulates a power law increase in pre-event seismicity. This log-periodic correction is evident in the regional seismicity data which preceded the 1989 Loma Prieta earthquake. The analysis will continue with the Loma Prieta data and be extended to other California sites and the Aleutian Islands. This research is a component of the National Earthquake Hazard Reduction Program. ***

9508040 SAMIS这项研究是为了检验一种导致地震破坏的过程理论，在该理论中，可以从以主震为临界点的重整化群理论中推导出幂函数失效时间方程。有一些证据表明，地震孕育过程涉及空间上扩展的区域断层网络的集体行为。例如，在许多大地震之前，主震周围的大范围内中等规模地震的数量会增加。重整化群理论处理的优点是可以得到对标度的一阶修正，它以失效时间的对数的周期函数的形式存在，并且调制了震前地震活动的幂规律增加。这种对数周期校正在洛马普里埃塔地震前的区域地震活动数据中表现得很明显。分析将继续使用Loma Prieta的数据，并扩展到加利福尼亚州的其他地点和阿留申群岛。这项研究是国家减少地震灾害计划的一部分。***