The Shallow Structure of the East Pacific Rise near Latitude9 Degrees 30' North

北纬9度30附近东太平洋海隆的浅层结构

• 批准号: 8917750
• 负责人: G. Michael Purdy
• 金额: $ 49.91万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-04-01 至 1993-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8917750&HistoricalAwards=false
• 关键词: Shallow; Structure; East; Pacific; Rise

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 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. Data from the experiment will be compared to drilling results which are 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.

在海底蔓延中心产生的浅海壳的性质受到可用地球物理数据的约束。最近的研究表明，地壳的最浅层的特征是地震速度极低，但速度随深度的迅速增加。了解控制这些变化的过程对于确定地壳的孔隙率，地壳岩石的改变以及地壳钻探数据的局部和区域意义很重要。 目前的奖项将支持对东太平洋赤道太平洋地区东太平洋崛起一部分的近底部折射研究。该项目将通过使用接收器和在海底部署的声源来详细研究浅层地壳。该技术将提供比正常地表船观测值相比提供的更高的分辨率研究。 将将实验的数据与沿着同一山脊的相同部分计划的钻井结果进行比较。该项目的主要研究人员在地壳数据的实验和理论分析中都具有区分记录。