Oddly, a tsunami cannot be felt as it passes ships on the open ocean, for the wave is usually small, one to two feet, and traveling very fast, as fast as airliners. It is only as it approaches shallow water that it begins to break; as the bottom of the wave slows, the top keeps traveling at the higher speed and increases in height, hitting landfall at 30 to 40 miles an hour. In 1958, an earthquake in Lituya Bay, Alaska, caused a landslide into the ocean that created a tsunami 1,720 feet high, a wave that could have swept over the Empire State Building. Fortunately it headed into a wilderness area and did not travel across the ocean to Hawaii or Japan. |
