How the Japan Earthquake Shortened Earth’s Day

The 8.9-magnitude earthquake in Japan shortened Earth’s day by 1.8 millionths of a second. While this might sound striking, perhaps even scary, don’t panic: Earth is shifting slightly all the time, owing mostly to atmospheric and ocean currents. The 8.9-magnitude earthquake in Japan on March 11 shortened Earth’s day by 1.8 millionths of a second, according to NASA scientists

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How the Japan Earthquake Shortened Earth’s Day