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By Sid Perkins for Nature magazine Beginning in late 2004, a flurry of massive, tsunami-spawning earthquakes have rocked the world, first slamming Indonesia, then Chile and most recently Japan. [More]

In the past 15 months several devastating earthquakes have rumbled beneath the Pacific.

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