Making a better magnetic map
Making a better magnetic map
复制标题
制作更好的磁力图
作者：
M. Catalan;J. Dyment;Y. Choi;M. Hamoudi;V. Lesur;E. Thebault;A. Santis;T. Ishihara;J. Korhonen;T. Litvinova;J. Luis;B. Meyer;P. Milligan;M. Nakanishi;S. Okuma;M. Pilkington;M. Purucker;D. Ravat;C. Gaina;S. Maus;Y. Quesnel;R. Saltus;P
在地球表面或接近地球表面的磁场测量可以探测到来自几个来源的磁场。超过90%的信号来自主地磁场，它类似于一个巨大的中央磁偶极子（https://en）。维基百科。相对于地球的旋转轴，它倾斜了大约9.5倍[thamesbault et al., 2015]。其余的可以用外部磁场和岩石圈中的磁性矿物来解释（https://en）。维基百科。岩石圈)-地壳和最上层的地幔层。科学家们认为这近10%的贡献是对主磁场的扰动，有点磁“噪音”，他们把这些小扰动称为“磁异常”。然而，这些异常的地图提供了地壳和可能的上地幔的视图。磁异常图提供了有关地球岩石圈的热结构、板块构造历史以及自然资源的位置和分布的信息。磁异常图提供了有关地球岩石圈的热结构、过去1.6亿年的板块构造历史以及自然资源的位置和分布（例如，大型铁矿石矿床）的信息。
Magnetic measurements at or near the Earth’s surface detect fields from several sources. More than 90% of the signal comes from the main geomagnetic field, which resembles a great central magnetic dipole (https://en. wikipedia. org/wiki/Earth's_magnetic_field) tilted by about 9.5 with respect to the Earth’s rotation axis [Thébault et al., 2015]. The rest can be explained by external fields and magnetic minerals in the lithosphere (https://en. wikipedia. org/wiki/Lithosphere)—Earth’s crust and uppermost mantle layer. Scientists think of this nearly 10% contribution as a perturbation of the main field, a bit of magnetic “noise,” and they refer to these small disturbances as “magnetic anomalies.” However, maps of these anomalies provide a view of the crust and possibly of the uppermost mantle.Magnetic anomaly maps provide information regarding the thermal structure of the Earth’s lithosphere, its plate tectonic history, and the location and distribution of natural resources. Magnetic anomaly maps provide information regarding the thermal structure of the Earth’s lithosphere, plate tectonic history of the past 160 million years, and the location and distribution of natural resources (large deposits of iron ore, for example).