Using Numerical Models of Poroelastic Fluid Flow to Constrain the Permeability Structure of Young Oceanic Crust

利用多孔弹性流体流动数值模型约束年轻洋壳的渗透性结构

• 批准号: 0928181
• 负责人: Timothy Crone
• 金额: $ 15.29万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0928181&HistoricalAwards=false
• 关键词: Using; Numerical; Models; Poroelastic; Fluid

New seafloor is created at a global network of mid-ocean ridges, where seawater circulating through the newly-formed crust causes hydrothermal alteration. Most of the world?s copper deposits formed in this way; indeed copper mined from hydrothermal deposits on the island of Cyprus fueled the advancement of western civilization. Hence, understanding hydrothermal circulation at mid-ocean ridges has fundamental scientific importance. Fluid flow is controlled principally by permeability, a property that is difficult to measure. However, it has been observed that, because they affect fluid pressures in the sea floor, tides trigger small earthquakes. It can be reasonably argued that the relationship between tides and the occurrence of these earthquakes depends on the permeability. This project is an innovative attempt to infer the permeability of new seafloor from tides and earthquake data from the East Pacific Rise. Funding this effort will improve our understanding of the working of the Earth, and support a promising young investigator.

新的海底是在全球洋中脊网络中形成的，海水在新形成的地壳中循环，导致热液蚀变。世界上大部分铜矿床都是这样形成的；事实上，从塞浦路斯岛热液矿藏中开采的铜推动了西方文明的进步。因此，了解洋中脊的热液循环具有重要的科学意义。流体流动主要由渗透性控制，渗透性是一种难以测量的特性。然而，据观察，由于潮汐影响海底的流体压力，因此会引发小地震。可以合理地认为，潮汐与这些地震发生之间的关系取决于渗透性。该项目是一项创新尝试，旨在根据东太平洋海隆的潮汐和地震数据推断新海底的渗透性。资助这项工作将增进我们对地球运作的了解，并支持一位有前途的年轻研究人员。