the tsunami hit alaska lity bay in july 9,1958 and the tsunami was about 1,720 feet tall. The 2011 tsunami inundated areas up to ~150 m from the coast near Horei Station of the Sanriku Railway. After 8 hours, the tsunami hit Hawaii and after 9.5 hours, the tsunami made landfall on the west coast of the United States. Researchers selected these heights to show the most dangerous areas; those where waters are up to head-height; knee-height flooding; and safe evacuation zones. The run-up of the 1964 tsunami that struck Alaska was as high as 90 feet (27.4 meters) in some places. Run-up factor is the deep-water wave amplitude divided by the run-up height. As the tsunami radiated out from Japan, it encountered the complex topography and bathymetry of sea floor, causing the wave to scatter and reflect. 1. When a tsunami comes ashore it moves inland higher and higher above mean sea level, eventually stopping and starting to flow back out. Extensive damage to buildings and roads, and large boats washed far ashore, provide valuable information to tsunami researchers. Many of us remember watching the catastrophic events of the 2004 Indian Ocean tsunami and the 2011 Japan earthquake unfold. Local topography and directional travel have a great influence on the run-up effect of earthquake generated tsunamis. Tsunamis range in size from inches to over a hundred feet. The 1933 tsunami height was 5 m, while the 1960 tsunami height was 3 m. At Sanrikucho-Okirai in Ofunato City, the 2011, 1896, and 1933 tsunamis caused similar inundations and runup heights; however, 1960 tsunami height was much smaller. The new maps show zones with more than 6 feet of inundation, 2.5 to 6 feet, zero to 2.5 feet and areas that even a 2,500-year tsunami likely wouldn’t reach. In Japan the run-up factor was 10 but can be as much as 25. Run-up height is the tsunami vertical height above sea level at its furthest point inland. The average size of a tsunami is 5-8 feet. In deep ocean, tsunami waves may appear only a foot or so high. Smaller tsunami, with a maximal wave height of 20 feet, were recorded in the Yakutat Bay, Disenchantment Bay, Dry Bay, Glacier Bay, Inian Island, Skagway and Dixon Harbor. The height of a tsunami as it approaches a shoreline is referred to as its "run-up." But as they approach shoreline and enter shallower water they slow down and begin to grow in energy and height. Observations have confirmed the runup height of 130 ft in parts of Japan. The most important measure of a tsunami is “run up”. GL :) ... What was the height of the tsunami in Alaska? A tsunami can be measured in wave height and wave speed and it was reported that the height of a tsunami wave that struck a coastal city in Japan's on March 11 at just over 77 feet high. In deep water (greater than 600 feet/180 meters), tsunamis are rarely over 3 feet (1 meter) and will not be noticed by ships due to their long period (time between crests). There are several different ways to measure tsunamis. Here, in Natori, Japan, south of Sendai, the height of damage indicates that the water flow from the tsunami wave was about 10 meters (33 feet).
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