RIDGE2000 Postdoc: Dynamics of Coupled Tectonic/Hydrothermal Systems at Mid-Ocean Ridges; a Damage Rheology Approach

摘要（Spiegleman - 0452457）这项研究将开发一个完全耦合的理论和数学基础，利用地震应变数据和热液观测来解释变形/渗透和反应介质中的流体流动、岩脉就位和地壳变形。 所采用的方法是基于最近开发的理论，不断变化的损坏的材料所产生的一个调查人员，最近已在小规模对实验室实验进行了验证。 这项研究涉及开发一套日益复杂的数字和概念模型，以处理大洋中脊脆弱/断裂/破裂的洋壳中的变形和热液循环耦合问题。 为了约束和验证这些模型，纽约哥伦比亚大学拉蒙·多尔蒂地球观测站的研究人员之间将进行合作，他们拥有关于在经过深入研究的里奇2000综合研究地点的海底热液系统地理的数据和第一手知识，以及这些地区相应的化学、水文和地球物理特征。 这些观测数据将用于确定最终模型的参数，并将使用来自自然系统的数据进行模拟和地面验证。 更广泛的影响：该项目为一名青年科学家提供跨学科培训，并促进海洋地质学和海洋物理学界的国际和跨学科合作。 它还为理解可变形脆性介质中流体的行为开发了一个更一般的框架，这是工程中的一个基本问题，具有地震动力学，火山爆发，山体滑坡和其他自然灾害的潜在应用。

ABSTRACT (Spiegleman - 0452457)This research will develop a fully coupled theory and mathematical basis to explain fluid flow, dike emplacement, and crustal deformation in deformable/permeable and reactive media using seismic strain data and hydrothermal observations. The approach adopted is based on the recently developed theory of evolving damaged materials generated by one of the investigators that has recently been validated at small scales against laboratory experiments. The research involves development of a set of numerical and conceptual models of increasing complexity that address coupled deformation and hydrothermal circulation in brittle/fractured/fracturing ocean crust at mid-ocean ridges. To constrain and verify these models, there will be collaborations between researchers at the Lamont Doherty Earth Observatory of Columbia University in New York who have data and first-hand knowledge of the geography of fractured-seafloor hydrothermal systems at intensively studied RIDGE 2000 integrated study sites and the corresponding chemical, hydrological, and geophysical characteristics in these areas. These observational data will be used to parameterize the final models and simulations will be carried out and ground truthed using data from natural systems. Broader Impacts: This project provides cross-disciplinary training for a young scientist and fosters international and interdisciplinary collaboration in the marine geology and geophysics community. It also develops a more general framework for understanding the behavior of fluids in deformable brittle media, which is a fundamental problem in engineering with potential applications to earthquake dynamics, volcanic eruptions, landslides and other natural hazards.