Collaborative Research: Resolving Structural Control of Episodic Tremor and Slip Along the Length of Cascadia

合作研究：解决卡斯卡迪亚沿线阵发性震颤和滑动的结构控制问题

• 批准号: 0642765
• 负责人: Michael Brudzinski
• 金额: $ 19.61万
• 依托单位: Miami University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-05-01 至 2011-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0642765&HistoricalAwards=false
• 关键词: Collaborative; Research; Resolving; Structural; Control

A deployment of broadband and short period seismic instruments from Earthscope's Flexible Array is being used to study segmentation along the length of the Cascadia subduction zone. The experiment is designed to examine the potential links between episodic tremor and slip and the three-dimensional structure of the overriding plate including differences in the geologic terranes and features associated with seismogenic behavior. The Flexible Array deployment complements existing seismic stations from the Transportable Array and permanent networks to provide a uniformly dense network with a typical station spacing of 40 km. Station coverage extends from northern California, through Oregon, to the northern border of Washington, from the coast to the eastern side of the volcanic arc. This dense seismic station coverage, combined with enhanced GPS instrumentation from the Plate Boundary Observatory, is being used to investigate spatial and temporal patterns of non-volcanic tremor and slow slip episodes throughout the entire Cascadia subduction zone. Preliminary work reveals segmentation in the characteristics of episodic tremor and slip which do not appear to correlate with the subducting plate. Seismic imaging of the overriding continental plate will provide the necessary structural control to investigate potential relationships with along-strike variations in geology and rheology of the upper plate.

正在使用Earthscope公司灵活阵列的宽带和短周期地震仪器来研究沿卡斯卡迪亚俯冲带沿着的分段。 实验的目的是检查之间的潜在联系，幕式震颤和滑动和三维结构的覆盖板，包括在地质构造的差异和功能与地震孕育行为。 灵活阵列部署补充了现有的移动式阵列地震台站和永久性网络，以提供一个均匀密集的网络，典型的台站间距为40公里。 观测站的覆盖范围从加州州北方，穿过俄勒冈州，一直延伸到华盛顿的北方边界，从海岸一直延伸到火山弧的东侧。 这种密集的地震台站覆盖面，加上板块边界观测站的增强型全球定位系统仪器，正被用来调查整个卡斯卡迪亚俯冲带的非火山震颤和缓慢滑动事件的时空模式。 初步工作揭示了分段的特点，幕式震颤和滑动，似乎没有相关的俯冲板块。 上覆大陆板块的地震成像将提供必要的结构控制，以调查与上板块地质和流变学沿走向变化的潜在关系。