The Shallow Seismic Structure of the East Pacific Rise

东太平洋隆起的浅层地震结构

• 批准号: 8917988
• 负责人: Gerard Fryer
• 金额: $ 13.73万
• 依托单位: University of Hawaii
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-08-15 至 1993-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917988&HistoricalAwards=false
• 关键词: Shallow; Seismic; Structure; East; Pacific

The nature of the shallow oceanic crust produced at seafloor spreading centers is poorly constrained by available geophysical data. Recent studies suggest that the shallowest layers of the crust are characterized by extremely low seismic velocities, but that the velocity increases rapidly with depth. Understanding the processes that control these variations are important in determining the porosity of the crust, alteration of crustal rock, and the local and regional significance of crustal drilling data. The present award will support Dr. Fryer's participation in a near bottom refraction study of a segment of the East Pacific Rise in the eastern equatorial Pacific. The project will allow a detailed study of the shallow crust by using both a receiver and acoustic source deployed at the seafloor. This technique will provide a higher resolution study than is available from normal surface ship observations. Dr. Purdy of Woods Hole has responsibility for obtaining the field data. Dr. Fryer will be involved in analysis of the data from the experiment which will be compared to drilling results planned along this same section of ridge. The principal investigators on this project have distinguished records in both experimental and theoretical analysis of crustal data.

海底产生的浅洋壳的性质 扩展中心受现有地球物理条件的限制很小 数据最近的研究表明， 地壳的特点是极低的地震速度，但 速度随深度迅速增加。了解 控制这些变化的过程在以下方面很重要： 确定地壳的孔隙度、地壳的蚀变 岩石，以及地壳钻探的局部和区域意义 数据 本奖项将支持弗赖尔博士参与一项 东太平洋一段近底折射研究 赤道东太平洋的上升。该项目将允许 通过使用接收器和 部署在海底的声源。这种技术将 提供比正常情况下更高的分辨率研究 水面舰艇观察伍兹霍尔的珀迪医生 负责获取现场数据。傅兰雅医生 参与分析实验数据， 与沿着该相同区段计划的钻探结果进行比较 的Ridge。这个项目的主要研究人员 在实验和理论上都有杰出的记录 地壳数据分析。