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The 1958 Lituya Bay megatsunami occurred on July 9 at 22:15:58, following an earthquake with a moment magnitude of 7.8 and a maximum Mercalli intensity of XI. The earthquake took place on the Fairweather Fault and triggered a rockslide of 30 million cubic metres to fall from several hundred metres into the narrow inlet of Lituya Bay, Alaska. The impact was heard 50 miles away, and the sudden displacement of water resulted in a megatsunami that washed out trees to a maximum elevation of 520 metre
It is also the second largest earthquake ever recorded, next to the M9.5 earthquake in Chile in 1960. The map shows the epicenter of the 1964 Great Alaska Earthquake (red star), caused when the Pacific Plate lurched northward underneath the North American Plate. Science Features: The 1964 Great Alaska Earthquake & Tsunami It was the largest U.S. earthquake ever recorded, and a turning point in earth science.