How Does an Earthquake Trigger Tsunamis Thousands of Kilometers Away?

The massive magnitude 8.9 earthquake that struck near the east coast of Honshu, Japan’s main island, at 2:46 P.M. local time and unleashed a fierce tsunami claiming hundreds of lives is already being felt as far away as the west coast of North America, about 8,000 kilometers away. Much of this has to do with the depth of the ocean that the tsunamis waves traversed as well as the sheer size of the quake, which was the strongest recorded in Japan’s history

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How Does an Earthquake Trigger Tsunamis Thousands of Kilometers Away?