关于地震的英语小短文 英汉翻译2
发布网友
发布时间：2023-10-10 13:02
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热心网友
时间：2024-11-23 18:40
Earth's inner core is a solid iron ball slightly smaller than the moon. Little is known about it, but geophysicists confirmed this year that it spins--faster than the solid layers of earth surrounding it.
Geophysicist Xiaodong Song of the University of Illinois at Urbana-Champaign and his colleagues studied seismic waves from doublets--pairs of earthquakes from the same place but occurring at different times. If the inner core was spinning faster, scientists reasoned, seismic waves from doublets would move through the core at different speeds as a result of the inconsistent makeup of the core's iron crystals.
Song calculates that the solid inner core spins just slightly faster per year than the rest of the planet, a difference that adds up to an extra revolution every 1000 years or so. His discovery could help explain how the inner core interacts with convection in the outer core to drive Earth's magnetic field. The field shields us from bombardment by charged particles from the sun.
"We have only a 30-to 40-year snapshot," cautions Song. The data his team uses first became available in the 1960s, when a worldwide seismographic network was established. What happened before that is unknown. Song expects more breakthroughs in the coming years--as long as Earth keeps quaking.
翻译： 地球的内核转动速度比外科快
地球的内核是一个比月亮体积稍小一些的铁球。人类对它所知甚少，但今年地球物理学家们确认它在旋转——而且旋转速度要比包围它的外壳快。
诺伊大学香槟分校的地球物理学家宋晓东和他的同事们研究了多组在同一地点不同时间发生的两次地震的地震波。科学家们分析，如果内核转动速度较快的话，那么这两次地震的地震波应该以不同的速度穿过内核，因为内核的铁晶体组成并不匀称。
宋的计算结果表明，内核的旋转速度每年要比外壳快一点点，要每1000年才会比外壳多转一圈。他的发现可以帮助解释内核是怎样影响外核的对流，并进一步影响地球磁场的。地球磁场能够保护我们不受来自太阳的带电粒子的轰炸。
“我们只有一个30到40年的快照，”宋警告说。“他的研究团队使用的数据是19世纪60年代产生的，当时全球地震波研究网络刚刚建立。在那之前发生过什么无法得知。宋期待着未来会有更大的进展——只要地球还在不断地地震。
热心网友
时间：2024-11-23 18:40
