Investigations of the Variations of the Cenozoic Magnetic Field in the Pacific

古地磁数据的分析通常假设， 地球的磁场，当平均超过几千年， 年，符合地心轴偶极子。 然而，已经发现长期的非偶极成分， 变得重要事实上，最近的分析表明， 新生代，多极场分量变化， 产生交替的“远边”和“近边”效果， 重要的规模。了解的性质和规模 这些偏离轴向偶极子的情况在平板中是重要的 利用古地磁数据进行构造重建， 重建通常假设偏差很小 与古地磁数据中的其他不确定性相比。 本建议赔偿额的目的是 从大量的古地磁资料中收集整理 太平洋上的活塞岩芯这些数据 在过去的几年中， 15年，形成了一个理想的数据集，用于检查 非偶极场的空间和时间方面。初始 该项目的活动将是使用 岩芯的地层一致 此外，本发明还 将检查各个数据点， 一致性和潜在的错误来源。 一旦这项任务 完成后，非偶极子场将在几个领域进行审查 太平洋盆地的一部分。 这个项目的首席研究员 有资格进行拟议的研究。资金高度 建议在18个月的FY87中以85，000美元的价格出售。

Analyses of paleomagnetic data generally assume that the earth's magnetic field, when averaged over several thousand years, conforms to that of a geocentric axial dipole. Nevertheless, long-term non-dipolar components have been found to be important. In fact, recent analyses suggest that during the Cenozoic, multipolar field components have varied so as to produce alternating "far-sided" and "near-sided" effects of significant magnitude. Understanding the nature and magnitude of these deviations from an axial dipole are important in plate tectonic reconstructions using paleomagnetic data, since such reconstructions generally assume that the deviations are small when compared to other uncertainties in the paleomagnetic data. The objective of the present recommended award is to assemble and compile the paleomagnetic data from a large number of piston core sites from the Pacific Ocean. These data were generated during a number of separate projects during the last fifteen years and form an ideal data set for examining both spatial and temporal aspects of the non-dipole field. Initial activity on this project will be to determine sediment ages using a consistent stratigraphy for the cores. Additionally, individual data points will be examined for both their consistency and potential source of error. Once this task is completed, the nondipole field will be examined in several areas of the Pacific Ocean basin. The principal investigator on this project is highly qualified to undertake the proposed study. Funding is highly recommended at $85,000 in FY87 for 18 months.