Which of the following U. S. earthquakes was the most powerful? Virginia, December 2003, magnitude of 4.5 Kentucky, July 1908, magnitude of 5.1 Illinois, January 2006, magnitude of 3.6 Washington, February 2001, magnitude of 6.8

Washington, February 2001, magnitude of 6.8 would be your answer

Explanation: The 40-second quake, calibrated at a magnitude of 6.8 on the revised Richter Scale, injures an estimated 200 persons in the region, and is cited as the cause of a fatal heart attack in Burien. Hardest hit structures are located in Olympia, including the State Capitol, and in Seattle's historic Pioneer Square.

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