A Seafloor Geodesy Experiment at the Discovery Transform Fault

发现转换断层的海底大地测量实验

• 批准号: 0351143
• 负责人: Jeffrey McGuire
• 金额: --
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-15 至 2008-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0351143&HistoricalAwards=false
• 关键词: Seafloor; Geodesy; Experiment; Discovery; Transform

McGuireAbstract Aseismic fault slip is one of the most important processes in plate tectonics. Oceanic transforms are advantageous for understanding aseismic fault slip because about 90% of the plate motion is aseismic and only about 10% results in earthquakes. This project will deploy as acoustic ranging system across the Discovery transform fault for one year that will be contemporaneous with a deployment of ocean bottom seismometers. The combination of this instrumentation, Discovery's fast slip rate, and the mixture of seismic and aseismic slip on the Discovery fault will yield constraints on the portions of the fault that fail seismically and aseismically. Inferences about the seismic and aseismic regions of the fault will be combined with both passive and active source seismic imaging results that will relate the behavior of the transform to rock mechanics knowledge about the deformation properties of basalt, gabbro, serpentine, and peridotite.

摘要地震断层滑动是板块构造中最重要的过程之一。 海洋转换有利于理解板块运动的非活动性，因为90%的板块运动是非活动性的，只有10%左右的板块运动会导致地震。 该项目将作为声学测距系统部署在发现号转换断层上，为期一年，与海底地震仪的部署同时进行。 该仪器、发现号的快速滑动速率以及发现号断层上地震和抗震滑动的混合物的组合将对地震和抗震失效的断层部分产生约束。 关于断层的地震和地震活动区域的推断将与被动和主动源地震成像结果相结合，这将把转换的行为与关于玄武岩、辉长岩、蛇纹石和橄榄岩的变形性质的岩石力学知识相关联。