Collaborative Research: Delineation of the Slab Geometry of the Cascadia Subduction Zone Using Broadband Teleseismic Waveform Analysis

合作研究：利用宽带远震波形分析描绘卡斯卡迪亚俯冲带的板片几何形状

• 批准号: 8803654
• 负责人: Thomas Owens
• 金额: $ 5.09万
• 依托单位: University of Missouri-Columbia
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-09-01 至 1989-09-01
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803654&HistoricalAwards=false
• 关键词: Collaborative; Research; Delineation; Slab; Geometry

This proposal seeks funding to deploy 7 temporary broadbandseismograph stations in a north.south profile at a longitude ofabout 123.oW in western Washington for the purpose of recordingteleseismic body waveforms. We intend to undertake a receiverfunction analysis of the recorded P.waves in order to delineatevariations in the amplitude and timing of Ps conversions from theoceanic Moho of the subducted Juan de Fuca plate that areindicative of variations in the geometry of the subducted slabalong its strike. Specifically, we will attempt to confirm andrefine a working hypothesis recently proposed that suggests thatthe Juan de Fuca plate may be deformed in a broad arch centered inthe vicinity of Puget sound. This model explains certain aspectsof the seismicity beneath this region as well as a number of othergeological and geophysical observations.

该提案寻求资金，以部署7个临时 南北向宽频带地震台站 位于华盛顿西部约123.oW的经度， 记录人体的电波。 我们打算进行一项 记录的P波的接收器功能分析，以便 描述Ps转换的幅度和时间的变化 来自胡安·德富卡板块俯冲的大洋莫霍面， 指示俯冲带的几何形状的变化 沿着它的罢工。 具体地说，我们将尝试确认 andrefine最近提出的一个工作假设， 胡安·德富卡板块可能变形成一个宽拱 位于普吉特海湾附近。 该模型解释了 该地区地震活动的某些方面以及 其他地质和地球物理观测的数量。