Stalking Cascadia Episodic Tremor and Slip with Enhanced GPS and Seismic Arrays

利用增强型 GPS 和地震阵列跟踪卡斯卡迪亚的阵发性震颤和滑动

• 批准号: 0542226
• 负责人: Kenneth Creager
• 金额: $ 1.7万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0542226&HistoricalAwards=false
• 关键词: Stalking; Cascadia; Episodic; Tremor; Slip

0542226CreagerMegathrust earthquakes, with similarities to the December 2004earthquake in Sumatra, are thought to occur along the Cascadia subduction zone withaverage repeat intervals of roughly 500 years. These earthquakes accommodate the relativemotion between the Juan de Fuca and North American plates along a fault that is mostly offshore, but may extend onshore in places such as the Olympic Peninsula. It has beenrecently discovered that much, if not all, of the slip along the portion of the plateboundary just down dip (east) of the megathrust earthquake zone is accommodated byepisodic tremor and slip (ETS) events that occur every 14 months in the regions from theOlympic Peninsula north into Vancouver Island. We propose to deploy arrays of seismometers and Global Positioning System instrumentation in order to record and better characterize the next ETS event which is expected to occur sometime in August, September or October, 2005.

克里格巨型逆冲断层地震与2004年12月苏门答腊地震相似，被认为发生在沿着卡斯卡迪亚俯冲带，平均重复间隔约为500年。这些地震适应了胡安德富卡和北美板块之间的相对运动，沿着沿着一个断层，该断层大部分在近海，但也可能在奥林匹克半岛等地向岸上延伸。最近发现，大部分（如果不是全部的话）沿着板块边界部分的滑动（沿着沿着），就在大逆冲断层地震带的倾角（东部），是由从奥林匹克半岛北部到温哥华岛每14个月发生一次的间歇性震颤和滑动（ETS）事件所适应的。我们建议部署地震仪和全球定位系统仪器阵列，以记录和更好地描述预计将在2005年8月、9月或10月发生的下一次ETS事件。