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CNN 国际新闻
📌 标题：A seismic event bounced off Earth’s core and shifted an island country
📅 发布时间：Updated Jun 24, 2026, 7:47 AM ET
📝 英文原文：
When massive 9.0 magnitude earthquake shook Japan on March 11, 2011, the ground also made a more lasting move. About 15 minutes after the event began at 2:46 p.m. local time, nearly the entire country shifted eastward, according to GPS station measurements.The lurch was small — 5 to 6 millimeters, or 0.20 to 0.24 inches — but permanent and at the time went largely unnoticed or was passed off as a data glitch. However, University of Chicago geophysicist Sunyoung Park felt the recorded signals that indicated a shift pointed to something tangible. In fact, the ground movement reflected an “extraordinary” and previously undocumented seismic phenomenon, accordingto a new study.“What was unusual about this movement is basically the whole of Japan was moving nearly uniformly at the same time,” said Park, who led the research.She added that the movement, which affected mainland Japan — Hokkaido to Kyushu — an area approximately 1,800 miles (3,000 kilometers) in length, did not match the timing of the initial earthquake, and it happened before any significant aftershocks.After years of analyzing GPS and seismic data, Park and her colleagues found that waves from the earthquake had traveled down to Earth’s core and then rebounded to the crust, displacing four major tectonic plates.While seismologists knew that waves from large earthquakes can travel down through the planet and bounce off its outer core, which is liquid metal, they thought that the energy dissipated before returning to Earth’s crust.“That type of deep-diving wave triggering some kind of event is new, and this event is very unusual, also in the sense that it’s so broad,” Park explained.Though earthquakes can cause dramatic ground movement — tearing ruptures in land and moving larger areas by several inches — such movement is typically more localized than the country-long seismic event detected by Park and her colleagues.Goran Ekstrom, a geophysicist at the Columbia University, said that In the 2011 earthquake,
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🇨🇳 中文翻译：
2011年3月11日，当日本发生9.0级大地震时，地面也做出了更持久的动作。活动于下午 2 点 46 分开始后约 15 分钟。根据 GPS 站的测量，当地时间，几乎整个国家都向东移动。这种倾斜很小——5 到 6 毫米，或 0.20 到 0.24 英寸——但却是永久性的，当时基本上没有被注意到，或者被误认为是数据故障。然而，芝加哥大学地球物理学家 Sunyoung Park 认为记录到的信号
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本文由自动抓取系统生成，英文原文已自动翻译为中文。 |
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