Investigation of Fluid Sources and Movement at the Cascadia Margin

在卡斯卡迪亚边缘增生棱镜沿着海岸 俄勒冈州、华盛顿和不列颠哥伦比亚省， 从排气口位置的流体排放速率表示流速3-6 比局部孔隙度预测值大几个数量级 增加沉积物的减少。该奖项将评估两个 这种差异的可能解决方案：流体从深处迁移 沿着断层带或近地表海水补给， 密度驱动流将评估沿断层带沿着的迁移 对钻孔进行贯通排放试验， 海洋钻探计划的加积棱镜。表面 将通过测量周围的原位渗透率来评估补给 边缘有活跃的通风口该项目的实地部分将 利用研究潜水器阿尔文号。

At the Cascadia Margin accretionary prism along the coasts of Oregon, Washington, and British Columbia, direct measurements of fluid discharge rates from vent sites indicate flow rates 3-6 orders of magnitude greater than those predicted by local porosity reduction in accreting sediments. This award will evaluate two possible solutions to this discrepancy: fluid migration from depth along a fault zone or near surface seawater recharge due to density-driven flow. Migration along a fault zone will be evaluated through discharge tests to be performed on boreholes drilled into the accretionary prism by the Ocean Drilling Program. Surface recharge will be evaluated by measuring in situ permeability around active vents on the margin. The field portion of this project will utilize the research submersible Alvin.