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我们知道任何关于地球核心的本质不是来自磁或地震测量?

有很多了解地球的核心从地震资料的分析,从详细的磁场地图和趋势。

还有其他测量造成了当前的理解地球的核心除了这两个?

回答

我想答案是“不”,因为“地震学(即。研究波的传播,在地球)比的方式告诉我们细节”。参见本文的论述:[刷,s . g . (1980)。发现地球的核心。*美国物理学杂志》上,48 *,705 - 724][1],这些课堂讲稿http://www.geo.uu.nl/ berg /地球动力学/ lecturenotes.pdf地球动力学。有趣的附加工具,你会发现这些作品是:1。计算出地球的* *质量* *(使用牛顿定律)。人们发现地球的平均密度是5500公斤/ m ^ 3美元,而岩石的表面只有密度2700 kg / m ^ 3美元,所以地球内部有更高的密度。假设压力无法负责增加密度,密度高来自化学变化,如金属,特别是因为地球的磁场。假设下的压力* *负责密度高,地球内部的气体,例如,普通空气比岩石更可压缩,所以地球内部的空气(本杰明·富兰克林在美国提出的!)。 2. A second clue that the Earth had to have a radially varying density came from the **Earth's moment of inertia** (which was a known quantity, based on astronomical measurements such as the **Earth's axial precession**), which makes it possible to create models that relate density and radius. Of course, with neither quantity well-known, you couldn't do too much with this. But assuming an iron core (with known density, and responsible for the Earth's magnetic field) overlaying a mantle (with density close to that of the Earth's surface), the first radial profiles could be made. 3. Models could be made that concerned themselves with the rigidity/deformation of the Earth under forces, such as the response to **ocean tides**, **terrestrial tides** and the **Chandler wobble**. These could be used to even construct some radial profiles of some approximate elastic properties. Only in the 1960s, after seismology was a firmly established technique, people additionally found additional non-seismic evidence of the **Earth's eigenvibrations/free oscillations** where the Earth (as a whole) rings like a bell, which was a very useful independent tool to verify layered profiles of the Earth's elastic properties, and which were important in the discovery of, e.g., the solid inner core. 4. The rigidity (from the previous point, and mentioned in the first point) can be linked to densities using (thermodynamical) **equations of state**. Hence, figuring out the appropriate relations between density/pressure/rigidity was of large importance. 5. Similarly, with the assumption that the Earth was made with the rest of the solar system, it was possible from the **spectral lines of the sun** and the **chemical makeup of meteorites** to figure out the likely bulk chemical composition of the Earth (https://en.wikipedia.org/wiki/Chondritic_uniform_reservoir). If you additionally know the pressure, density and rigidity information, you can make relatively informed guesses about *candidate materials* that must be present. That is, similar to the answer by a_donda, one must still test how materials really behave in these strange pressure and temperature regimes, which is mostly laboratory work using, e.g., a **Diamond Anvil Cell**. 6. Similarly, these lab experiments can tell us that for a given pressure on a given material, what the expected temperatures can be. But if you want very solid answers about the 'nature' of the Earth's core, all the most direct answers come straight from seismology. That is the best method to actually constrain the *location* of the (elastic) properties within the Earth, at a much higher accuracy than any of the other methods can. As secondary consequences, we can use these measurements to make chemical hypotheses about the makeup of the core etc., but those are entirely based on the assumption that the seismic data is correct....so they're not an 'independent' kind of measurement/model! [1]: https://aapt.scitation.org/doi/citedby/10.1119/1.12026

编辑总结

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\ begingroup美元严重需要引用。“地球的重量”是一个物理的误解。有什么“太阳的谱线”与“陨石的化学组成”。你说的是太阳的吸收光谱?小行星或光谱类?这两个之间的联系在哪里?地球“戒指像贝尔”?和旋进可用于确定密度?所以如何?引用请! There seems to be a lot of confusion in this answer. \ endgroup美元
- - - - - -user20217
2020年4月5日13:43
\ begingroup美元 @a_donda所有信息来自两个相关文档评审材料……我必须请您留意那些如果你关心整个故事,这些仅仅是一些提示关于完整的故事。你当然对“地球”的重量!:-) \ endgroup美元
- - - - - -埃里克
2020年4月5日14:50
\ begingroup美元而我的问题是比我想象的要微妙得多,这个答案最好地址我希望将探索,因此,虽然我还不能接受任何回答“正确的”答案我肯定奖的赏金。现在我去读这些。谢谢! \ endgroup美元
- - - - - -uhoh
2020年4月10日,在跑
1

\ begingroup美元两个引用大多是历史,思想在太空时代之前,射电天文学和现代通信。问题问是否“有其他测量造成了当前的理解地球的核心除了这两个?”The answer is definitely yes, and extending this to other planets, the answer is a resounding yes. \ endgroup美元
- - - - - -大卫Hammen
2020年9月20日22:09
\ begingroup美元这是公平的。注意,我给一大堆的选择,还是结束前“不”……这样做的原因可能是,作为一个地震我主要关心地震属性的核心,通过地震学是最好的!:-)化学家将关心的化学组成。等等! \ endgroup美元
- - - - - -埃里克
2020年9月21日进行

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