The glacier had risen in the air and moved forward so it was in sight. Lituya Bay was in the area of XI intensity. The wave started for us right after that and I was too busy to tell what else was happening up there.The wave caused damage to the vegetation up the headlands around the area where the rockfall occurred, up to a height of 520 metres (1,710 ft), as well as along the shoreline of the bay.Around five megatsunamis are believed to have occurred at Lituya Bay during a period of about 150 years:The mechanism giving rise to megatsunamis was analyzed for the Lituya Bay event in a study presented at the Although the earthquake which caused the megatsunami was very energetic and involved strong ground movements, several possible mechanisms were not likely or able to have caused the resulting megatsunami. The megatsunami itself measured between 100 feet (30 meters) and 300 feet (91 meters), but the subsequent breaking wave became much bigger. Photo by D.J. Areas where soil and vegetation were removed are still clearly visible. I know you can't ordinarily see that glacier from where I was anchored. The wave then continued down the entire length of Lituya Bay, over La Chaussee Spit and into the Gulf of Alaska. 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. The force of the wave removed all trees and vegetation from elevations as high as 1720 feet (524 meters) above sea level. I don't mean it was just hanging in the air.
I can't help it if they don't believe me. That was six miles away and they still looked like big chunks. Neither water drainage from a lake, nor landslide, nor the force of the earthquake itself led to the megatsunami, although all of these may have contributed. Millions of trees were uprooted and swept away by the wave. The front of Lituya Glacier is visible in the lower left corner. The force of the wave took out trees 1,720 feet above sea level. The elevation of water in Lituya Bay is sea level. Miller, United States Geological Survey.Photo looking down the Fairweather Fault Trench at the head of Lituya Bay. ... dumping it 3,000 feet into the bay below. People shake their heads when I tell them I saw it that night.
It seems to be solid, but it was jumping and shaking like crazy. If a tsunami hits a relatively float shore, the wave will push inland rather than up. Evidence suggests that it was not the first of its kind. 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", The cliff where the rockslide originated is on the right side of Gilbert Inlet.
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.
The front of Lituya Glacier with lateral and medial moraines is seen terminating in Gilbert Inlet. It is about seven miles long (11.3 kilometers) and up to two miles wide (3.2 kilometers).
I know the glacier is hidden by the point when you're in Anchorage Cove, but I know what I saw that night, too. The head of the slide was at an altitude of about 3,000 feet (914 meters), just below snowfield in upper center. On the night of July 9, 1958, an earthquake along the Fairweather Fault in the Alaska Panhandle loosened about 40 million cubic yards (30.6 million cubic meters) of rock high above the northeastern shore of Lituya Bay.
The 1958 tsunami that ripped through Lituya Bay, a sleepy fjord near the Gulf of Alaska, was eight times bigger. The mountains were shaking something awful, with slide of rock and snow, but what I noticed mostly was the glacier, the north glacier, the one they call Lituya Glacier. They are the light green areas of different vegetation color around the rim of the bay.Lituya Bay a few weeks after the 1958 tsunami. Photo by D.J. It must have risen several hundred feet.
The largest tsunami ever recorded on Earth occurred on July 9, 1958. 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.
Near the crest of the Fairweather Mountains sit the Lituya and the North Crillon glaciers.
The areas of destroyed forest along the shorelines are clearly recognizable as the light areas rimming the bay. Miller, United States Geological Survey.Stump of living spruce tree broken off by the giant wave at Harbor Point, mouth of Lituya Bay.
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