Juan de Fuca Plate Geodesy: Juan de Fuca Ridge and Cascadia Subduction Zone

胡安德富卡板块大地测量：胡安德富卡海岭和卡斯卡迪亚俯冲带

• 批准号: 9907247
• 负责人: Fred Spiess
• 金额: $ 69.62万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-12-15 至 2003-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9907247&HistoricalAwards=false
• 关键词: Juan; de; Fuca; Plate; Geodesy

This project uses combined GPS and underwater acoustic geodetic techniques. Recent results indicate that the convergence of the Juan de Fuca and the North America plates across the northern Cascadia subduction zone is more northerly than models predict. A similar experiment will be conducted across the southern Cascadia subduction zone off the Oregon coast. Another recent result indicates that there was no motion across the Cleft segment of the Juan de Fuca ridge over a two-year period even though there was steady motion of the Juan de Fuca plate. Thus, this work will try to document whether the strain deficiency is being accommodated in the immediate flanking ridges or in a more widely distributed manner.

该项目使用GPS和水声大地测量相结合的技术。最近的结果表明，胡安德富卡和北美板块在卡斯卡迪亚北部俯冲带的会聚比模型预测的更偏北。类似的实验将在俄勒冈州海岸外的卡斯卡迪亚南部俯冲区进行。最近的另一项结果表明，尽管胡安德富卡板块有稳定的运动，但在两年的时间里，没有穿过胡安德富卡脊裂裂段的运动。因此，这项工作将试图证明应变不足是在紧邻的侧翼脊处被适应，还是以更广泛的分布方式被适应。