With a magnitude of 9.5, the earthquake was the most powerful such event of the 20th century. Other recent earthquakes have caused more damage and loss of life, however. The Indian Ocean tsunami of 2004 was caused by a magnitude 9.1 earthquake; it killed at least 225,000 people in a dozen countries. The Japan earthquake of 2011 had a magnitude of 9.0; it spawned a tsunami that killed an estimated 19,300 people in Japan and knocked out the electrical power to Japan’s Fukushima Daiichi nuclear power plant, creating the world’s second most serious nuclear emergency.
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