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

[00:54 . 22]巨型逆冲地震，与2004年12月的苏门答腊地震相似，被认为发生在卡斯卡迪亚俯冲带，平均重复间隔约为500年。这些地震适应了胡安德富卡板块和北美板块之间的相对情感，这些断层大部分位于近海，但可能在奥林匹克半岛等地方延伸到陆上。最近发现，大部分（如果不是全部的话）沿着大逆冲地震带的板块边界向下倾斜（东）的部分滑动是由从奥林匹克半岛向北到温哥华岛每14个月发生一次的地震和滑动（ETS）事件所容纳的。我们建议部署地震仪阵列和全球定位系统仪器，以便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。

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.