Tectonism within the axial valley walls of an intermediate spreading center: south Cleft Segment of the Juan de Fuca Ridge

中间扩张中心的轴向谷壁内的构造活动：胡安·德·富卡海岭南裂段

• 批准号: 0551765
• 负责人: C. David Chadwell
• 金额: $ 9.07万
• 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: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-02-01 至 2008-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0551765&HistoricalAwards=false
• 关键词: Tectonism; within; axial; valley; walls

Using a new technique, researchers will re-analyze existing seafloor geodetic data from a 6-transponder array deployed across the axial valley at the Cleft Segment of the intermediate rate Juan de Fuca spreading center. By adding the ship's hydrophone as one of the GPS-located points and accounting for its motion and sound speed stratification, the researchers have previously demonstrated the capacity to improve velocity estimates from marine geodetic networks. The application of this method to the Cleft Segment data will constrain the pattern of deformation across the spreading ridge, including resolving whether this area is the locus of asymmetric spreading, distinguishing among crustal transport hypotheses, and determining where plate motion initiates. Broader impacts include the contributions of the refined analyses to advancing marine geodetic studies, training of a graduate student, and enhancement of our understanding of deformational processes in the zone of crustal formation.

研究人员将使用新技术，重新分析现有的海底大地测量数据，该数据来自部署在中速胡安·德富卡传播中心裂隙段轴谷上的 6 转发器阵列。 通过将船舶的水听器添加为 GPS 定位点之一并考虑其运动和声速分层，研究人员此前已经证明了改进海洋大地测量网络速度估计的能力。 将此方法应用于裂隙段数据将限制整个扩张脊的变形模式，包括解决该区域是否是不对称扩张的场所、区分地壳输送假设以及确定板块运动的起始位置。 更广泛的影响包括精细分析对推进海洋大地测量研究的贡献、研究生的培训以及增强我们对地壳形成区域变形过程的理解。