Collaborative Research: The time averaged field initiative: addressing a critical data gap

古磁数据在地球的各种地球物理研究中发挥着重要作用，包括板块构造重建、磁地层学和古代地磁场行为的研究（我们称之为古地磁）。自诞生以来，许多古地磁研究的关键假设是古磁场的平均方向对应于地心轴偶极子（GAD）产生的方向，并且磁场相对于水平面的倾角提供了足够精度的数据，使其能够在板块重建中使用。该提案将增强进入时间平均场模型的基础数据，该模型评估地磁场可以被视为“GAD”的程度。所需要的是来自全球 100 多个采样点的数据集。为了最有价值，数据集将具有方向和强度数据，并且具有出色的年龄控制。对数据进行有意义的解释所需的质量意味着地球上很少有地方具有足够的覆盖范围。手头的任务是艰巨的，必须一次只进行一项研究。我们在此建议开发以色列火山田的潜力，该火山田拥有大量古地磁方向以及 K-Ar 和 40Ar/39Ar 日期形式的初步数据。该提案涉及对地球最重要的物理特性之一——磁场的理解。磁场是具有方向和强度的矢量。 虽然获取古场方向相对简单，但提取准确的古场强度信息却并非如此。 我们在此建议尝试获取完整的矢量信息，并将其与准确的年龄信息结合起来，以便对以色列火山中记录的古代磁场进行 4 维观察。 这项工作有助于理解许多基本过程，包括构造板块的运动、内核在控制地磁场中的作用，以及确定磁场的平均强度以正确看待最近的观测结果。地磁场的约束对于研究地球深处动力学过程的人来说非常重要。此外，它将作为研究生的博士论文项目。

Paleomagnetic data play an important role in a variety of geophysical studies of the Earth, including plate tectonic reconstructions, magnetostratigraphy, and studies of the behavior of the ancient geomagnetic field (which we call paleo-geomagnetism). Ever since its inception, the key assumption in many paleomagnetic studies has been that the average direction of the paleomagnetic field corresponds to one that would have been produced by a geocentric axial dipole (GAD), and that the dip of the magnetic field from the horizontal plane provides data of sufficient accuracy to enable their use in plate reconstructions. This proposal will enhance the underlying data that go into time averaged field models, which assess the degree to which the geomagnetic field can be considered "GAD". What is required are data sets with more than 100 sampling sites from all over the globe. To be of most value the data sets would have both directional and intensity data and have excellent age control. The quality required for meaningful interpretation of the data mean that there are very few places on Earth that have adequate coverage. The task at hand is daunting and must be attacked one study at a time. We propose here to exploit the potential of the volcanic fields of Israel, for which there is an enormous amount of preliminary data in the form of both paleomagnetic directions and K-Ar and 40Ar/39Ar dates. This proposal concerns the understanding of one of the most important physical properties of planet Earth, its magnetic field. Magnetic fields are vectors with both direction and strength. While obtaining ancient field directions is relatively straight-forward, extracting accurate ancient field strength information is not. We propose here to attempt to obtain the full vector information and couple it with accurate age information for a 4-D look at the ancient magnetic field as recorded in the volcanics of Israel. This work can contribute to the understanding of many fundamental processes, including the motions of tectonic plates, the role of the inner core in controlling the geomagnetic field, and establishing the average strength of the magnetic field to place recent observations in perspective. Constraints on the geomagnetic field are important to those who study the dynamical processes in Earth?s deep interior. Also, it will serve as the doctoral dissertation project of a graduate student.