Magnitude of 9.3, second largest earthquake ever recorded. It had the longest duration ever observed, 10 minutes. Caused the entire planet to vibrate.

The 2004 Indian Ocean earthquake was an undersea earthquake that occurred on December 26, 2004, with an epicentre off the west coast of Sumatra, Indonesia. It is known by the scientific community as the Great Sumatra-Andaman earthquake. Killing more than 225,000 people in eleven countries, and inundating coastal communities with waves up to 30 meters (100 feet) high...

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Source: wikipedia