Structure of the magnetic lithosphere from joint analysis of satellite and airborne data

卫星和机载数据联合分析的磁性岩石圈结构

• 批准号: 273443909
• 负责人: Professor Dr. Jörg Ebbing
• 金额: --
• 依托单位: Arbeitsgruppe Satelliten- und Aerogeophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/273443909?language=en
• 关键词: Structure; magnetic; lithosphere; joint; analysis

The proposal is presenting a continuation of the work on the magnetic lithosphere on a global scale, which started in the first phase of the SPP in the project “Structure of the magnetic lithosphere from global analysis of satellite data”. The first project aimed at estimating the properties of the magnetic lithosphere on a global scale (magnetization, thickness, composition) from joint analysis of gravity and magnetic satellite data in combination with seismic results. The current representation of the magnetic lithosphere, the part of crust and upper mantle that can contain magnetization, is used here as a-priori information in the inversion of aeromagnetic data. The aim is to build hybrid models that can explain the different spectral domains represented by satellite and aeromagnetic observations. An important element is to extend existing inverse modelling codes to be able to handle multiple data sets in a consistent manner and to study in a Bayesian framework the cross-dependencies between the different elements influencing the inversion results. The inverse code will be tested against synthetic examples based on the real 3D Earth description from the first SPP phase and realistic implementation of more local information. Next, the inversion will be applied to regional aeromagnetic compilations (e.g. Circum-Arctic, Antarctica, Australia, Canada) to achieve high-resolution magnetization models. The influence of constraints from petrophysical data and other geophysical methods will be studied carefully to provide uncertainties on the obtained results. This is for example important to define a confidence level of any geologic interpretation that is further on used for studies addressing heat-flow or other. A related aspect is a study element addressing the gain by new satellite configuration with respect to change in orbit for the existing Swarm satellites and the extended Swarm mission period and the possible benefit from additional satellites at lower orbit height.

该提案是对全球范围内关于磁性岩石圈的工作的延续，该工作始于战略性计划项目的第一阶段，即“从全球卫星数据分析得出磁性岩石圈的结构”项目。第一个项目旨在通过对重力和磁性卫星数据的联合分析，结合地震结果，在全球范围内估计磁性岩石圈的性质(磁化、厚度、成分)。在航磁资料的反演中，本文使用磁性岩石圈的电流表示，即地壳和上地幔中可以包含磁化作用的部分，作为先验信息。其目的是建立能够解释卫星和航磁观测所代表的不同谱域的混合模型。一个重要的要素是扩展现有的逆向建模代码，使其能够以一致的方式处理多个数据集，并在贝叶斯框架内研究影响反演结果的不同要素之间的交叉依赖关系。逆代码将根据第一个SPP阶段的真实3D地球描述和更多本地信息的真实实现来针对合成示例进行测试。接下来，反演将应用于区域航磁汇编(如环-北极、南极洲、澳大利亚、加拿大)，以实现高分辨率的磁化模型。将仔细研究岩石物理数据和其他地球物理方法的约束的影响，以提供对所获得结果的不确定因素。例如，这对于定义进一步用于热流或其他研究的任何地质解释的置信度是重要的。一个相关的方面是一项研究内容，涉及新的卫星构型对现有卫星群和延长的群卫星飞行任务周期的轨道变化的影响，以及在较低轨道高度增加卫星可能带来的好处。