Analysis of Unusual Seismic Events and Constraints on the Active Tectonics and Rheology of the San Andreas Fault System: The Mendocino Triple Junction and Parkfield-Cholame, CA

异常地震事件分析以及对圣安德烈亚斯断层系统活动构造和流变学的限制：门多西诺三重交界处和加利福尼亚州帕克菲尔德-乔拉姆

• 批准号: 0537641
• 负责人: Robert Nadeau
• 金额: $ 15.43万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-06-15 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0537641&HistoricalAwards=false
• 关键词: Analysis; Unusual; Seismic; Events; Constraints

The proposed research will obtain a clearer picture of unusual events within the San Andreas Fault system and will use this information to gain a better understanding of the of active tectonics in California. The work will focus on two contrasting regions along the San Andreas Fault near the Mendocino Triple Junction and the Parkfield-Cholame segment of the fault. The researchers have found significant repeating earthquake activity in these areas and deep non-volcanic tremor activity. These phenomena will be characterized using the newly available continuous data recordings from the entire Northern California Seismic Network going back through 2000. This will allow a more accurate comparison between properties of tremors along transform and subducting plate boundaries. Auxiliary information from geodesy and from the seismicity patterns of more typical seismic events will also be used to constrain the analysis and interpretation of the results. Results from these activities have important implications for our understanding of active tectonics along the SAF plate boundary, and for understanding the role of deep fault zone rheology and deformation on earthquake occurrence. A comprehensive characterization and comparative analysis of the behavior of unusual events in contrasting tectonic regimes should also help increase our knowledge of deep fault zones in general.This project will produce catalogs of slow earthquake, tremor and repeating earthquake activity that do not currently exist. The proposed activity will also be a principal component of a graduate student's Ph.D. Thesis, and the results will be disseminated to the public through K-12 tours and annual public open houses of the Berkeley Seismological Lab. The projects activities will also benefit society by providing a greater understanding of the complex processes occurring in the Mendocino Triple Junction which is critical for the accurate assessment of the seismic hazard posed by the active tectonics of this region

拟议中的研究将获得圣安德烈亚斯断层系统内不寻常事件的更清晰的图片，并将利用这些信息更好地了解加州的活动构造。这项工作将集中在两个对比鲜明的地区沿着圣安德烈亚斯断层附近的门多西诺三重结和帕克菲尔德-乔莱姆段的断层。研究人员在这些地区发现了显著的重复地震活动和深层非火山震颤活动。这些现象的特点是使用新的可用的连续数据记录从整个北方加州地震网络追溯到2000年。这将允许沿沿着转换和俯冲板块边界的震颤属性之间的更准确的比较。还将利用大地测量学和较典型地震事件的地震活动模式提供的辅助信息来限制对结果的分析和解释。这些活动的结果对于我们理解SAF板块边界沿着的活动构造，以及理解深断裂带流变和变形在地震发生中的作用具有重要意义。对不同构造体系中异常事件的行为进行全面的描述和比较分析，也有助于增加我们对深断层带的总体认识。拟议的活动也将是研究生博士学位的主要组成部分。论文和结果将通过K-12图尔斯之旅和伯克利地震实验室的年度公众开放日向公众传播。项目活动还将使社会受益，使人们更好地了解门多西诺三重接合处发生的复杂过程，这对准确评估该地区活动构造造成的地震危险至关重要