Whole Earth Mantle Conductivity

地幔电导率的综合研究将 利用新的和已经公布的反应进行 功能协调发展的 这项工作将汇集响应功能， 各种来源的组合解释，从而获得 最佳的空间和频率覆盖。 在 PI将补充的数据很少的频段 这些响应函数与新的估计，从磁 观测数据和长周期MT数据。 各种新 地磁数据反演技术已经发展起来 在过去的几年里，包括D+存在算法， 漏斗函数方法，以及平滑模型的发现 通过非线性逆问题的正则化。 法律与正义党 将系统地将这些应用于全球应对措施， 函数集合来模拟整个地幔的电导率 地球 正则化方法的扩展将允许它们 验证地幔电导率结构的各种假说; 例如，在670公里地震波处， 不连续性与数据一致或数据要求的不连续性？ 有没有 低于该深度，电导率的横向不均匀性不会 数据所要求的？ 这些问题的答案可以提供 对地球内部物理学的宝贵见解

A comprehensive study of mantle electrical conductivity will be carried out using both new and already published response functions. The work will bring together response functions for a variety of sources for combined interpretation, thereby obtaining the best possible spatial and frequency coverage. In the frequency bands where there are few data the PIs will supplement these response functions with new ones estimated from magnetic observatory data and from very long period MT data. Various new techniques for inverting geomagnetic data have been developed over the past few years, including the D+ existence algorithm, the funnel function approach, and the finding of smooth models through regularization of non-linear inverse problems. The PIs will apply these in a systematic way to the global response function collection to model mantle conductivity for the whole Earth. Extensions to the regularization approach will allow them to test various hypotheses about mantle conductivity structure; e.g. Is a jump in conductivity at the 670km seismic discontinuity consistent with or required by the data? Is there a depth below which lateral heterogeneity in conductivity is not required by the data? The answers to such questions may provide valuable insight into the physics of the Earth's interior.