What was the largest tsunamis hight?
Well it depends on where and when you’re measuring it. In deep water tsunami are long wavelength fast moving waves with a small amplitude (or height) measuring centimetres. When tsunami move close to the shoreline (where the water is shallower) they slow down. This causes the wave to “bunch up” and increase in height, sometimes up to many metres. There are many different factors that affect the height of a tsunami wave onshore including the distance from the earthquake, the shape of the sea floor along the coast and whether the location is in a bay, inlet or beach. Tsunami height, when they break on land are very difficult to measure (and dangerous too). Most scientists talk in terms of tsunami “run-up” which is the highest vertical point the wave reaches. This is also more descriptive of the area that would be damaged by the wave. In any case the largest tsunami ever recorded was caused by a landslide in Alaska that fell into a narrow fiord in 1958. It ran up the walls of the fiord to
