EAGER: Mantle Rheology and the Dynamics of Suboceanic Mantle: A Bottom-Up Approach

地幔中的流动模式不能直接观察到，但可以通过在计算机模拟中实现已知地球物质物理行为的模型来了解。这种方法存在着不确定性，而这个项目的目标就是其中之一——对地幔矿物如何变形的不完善的了解。实验室研究提供了约束，但直接测量和推断的物质流动规律都具有不确定性。这种微观行为的不确定性的定量描述将首次直接包括在宏观尺度的地幔流动模拟中。这将产生与地球相关的一系列可能组成体系结构的模型空间的概率描述。已知局部矿物变形机制、晶粒尺寸、位势温度、压力、水和熔体等都会影响地幔岩石的应力-应变关系。以前开发的贝叶斯方法将被修改，以允许包括各种架构。研究生将接受地球物理学数值模拟前沿的培训，并将获得对实验室结果的洞察力——这是一个在大多数系中并不典型的跨学科背景。将建立一个网站，供研究人员查询地幔流动规律规范的自洽描述。

The pattern of flow in the mantle cannot be observed directly but is informed by implementing models of known physical behavior of Earth materials in computer simulations. There are uncertainties associated with this approach and this project targets one of them- the imperfect knowledge about how mantle minerals deform. Laboratory studies provide constraints but both the direct measurements and the inferred material flow laws have uncertainty. A quantitative description of this uncertainty in microscopic behavior will, for the first time, be included directly in the macro-scale mantle flow simulations. This will result in a probabilistic description of the model spaces relevant for the Earth for a range of likely constituent architectures. Local mineral deformation mechanism, grain size, potential temperature, pressure, water, and melt are all known to affect stress-strain relations in mantle rock. A previously developed Bayesian method will be modified to allow various architectures to be included. A graduate student will receive training at a forefront of numerical modeling in geophysics and will gain insight to laboratory results- a cross disciplinary background that is not typical in most departments. A website will be developed for researchers to query for self-consistent descriptions of mantle flow law specification.