The front of Lituya Glacier is visible in the lower left corner.

Instead, the megatsunami was caused by a massive and sudden A subsequent analysis that examined the wider impact of the event found that the rockfall itself was inadequate to explain the resulting accounts and evidence.Miller, Don J., 1954, "Cataclysmic Flood Waves in Lituya Bay, Alaska",

Photo by D.J. Miller, United States Geological Survey.Wave damage areas along the shorelines of Lituya Bay, viewed from the south. The elevation of water in Lituya Bay is sea level. People shake their heads when I tell them I saw it that night. The force of the wave removed all trees and vegetation from elevations as high as 1720 feet (524 meters) above sea level.

Millions of trees were uprooted and swept away by the wave. The head of the slide was at an altitude of about 3,000 feet (914 meters), just below snowfield in upper center. Areas where soil and vegetation were removed are still clearly visible. Miller, United States Geological Survey.Stump of living spruce tree broken off by the giant wave at Harbor Point, mouth of Lituya Bay.

It was anchored near the mouth of the bay and was sunk by the big wave.

They are each about 12 miles (19 km) long and 1 mile (1.6 km) wide with an elevation of 4,000 feet (1,200 m).

Map information from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Stover and Jerry L. Coffman, U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993.The cliff on the northeast wall of Gilbert Inlet showing the scar of the 40 million cubic yard (30.6 million cubic meters) rockslide that occurred on the day before this photo. Tree trunks can be seen in the water and tree stumps along the lower shoreline. 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 1,720 feet at the entrance of Gilbert Inlet. That was six miles away and they still looked like big chunks. When will the next one occur?

It has a maximum This is the highest wave that has ever been known.Lituya Bay is an ice-scoured tidal inlet on the northeast shore of the Gulf

Near the crest of the Fairweather Mountains sit the Lituya and the North Crillon glaciers.

This is the lar The bay was noted in 1786 by Jean-François de La Pérouse, who named it Port des Français. Trees and soil were stripped away to an elevation of 1720 feet (524 meters) above the surface of Lituya Bay. depth of about 720 feet (219 meters), but a sill of only 32 feet (9.7 meters) in depth separates it from the Gulf of Alaska between La Chaussee Spit and Harbor Point. Scientists concluded that there had been a "dual slide" involving a rockfall which also triggered a release of 5 to 10 times its volume of sediment trapped by the adjacent Lituya Glacier, a ratio comparable with other events where this "dual slide" effect is known to have happened. Lituya Bay was in the area of XI intensity.

Photo by D.J. The 1958 Lituya Bay earthquake occurred at July 9 at 22:15:58 with a moment magnitude of 7.8 and a maximum Mercalli intensity of XI. Photo by D.J. A fishing boat anchored in the cove at lower left was carried over the spit in the foreground; a boat under way near the entrance was sunk; and a third boat, anchored near the lower right, rode out the wave.

The areas of destroyed forest along the shorelines are clearly recognizable as the light areas rimming the bay.

All of these waves were significant in size, but shoreline evidence for all of them was removed by the 1958 wave.

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