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科学美国人60秒:雷电可能会“击沉”山峰

来源:慢速英语   时间:2020-05-08 16:56:28

LightningMay Sink MountainSummits

雷电可能会击沉山峰

Rocks are pretty tough, but eventually, even the mightiest mountains crumble. Geologists usually give the credit to water and ice. But when it comes to smashing summits, a major player may be electricityin the form of lightning. Scientists have found evidence for lightning;s role in mangling mountains in the magnetic signatures of rocks, which go haywire when blasted by bolts.

岩石是非常坚硬的,但最终就算最强大的山脉也会崩塌。地质学家通常归此功于水和冰。但说到击溃山峰,主要的因素还是电雷电。科学家们发现了雷电利用岩石的磁性特征重整山脉的证据,岩石的磁性特征决定了当它被雷电击中时就会崩溃。

\I mean, these magnetic anomalies are huge. Susan Webb of the University of Witwatersrand in South Africa. And so, we don;t expect to see that, not with ice fracturing rocks. We would see that only with lightning fracturing rocks. And the fact that there;s so many tells you that;s a really important mechanism for weathering rocks.

就是说,这种磁异常非常巨大。南非威特沃特斯兰德大学的苏珊韦伯说。所以,我们并没指望能看到这种现象,它不像冰压裂岩石那样。我们只会看到雷电压裂的岩石。而很多现象都告诉我们,这对风化岩石来说是一个非常重要的原理。

Webb presented her results on December 18th at the annual meeting of the American Geophysical Union in San Francisco.

韦伯在12月18日旧金山召开的美国地球物理联盟年度会议上提出了该研究结果。

As a test case, she studied the magnetic signatures of rocks in the southern African country of Lesotho, a place with lots of mountains and lots of lightning. But Webb says she;s only scratched the surface. And I think as we look more and more for this, and it;s very easy to look for if we do magnetic surveys in these areas, we will see it. Then we;ll be able to tell if this is a much more widespread phenomenon.

作为一个测试案例,她曾在非洲南部国家莱索托研究岩石的磁学特征,该地区拥有非常多的山脉且经常有雷电。但韦伯说她只接触到了一点皮毛。我认为我们应该更多地深入挖掘,而且在这些地区做研究很容易,因为我们能够亲眼见到这些现象。如果这成为一个更普遍的现象,我们就能够给出准确的结论。