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Such a polite natural disaster, you can set your watch to it!
It seemed too cut and dried but it is based on prior events in 1905 and 1936 in regards to amount of debris and water displacement. Both of those times the Tsunamis were huge. 1905 the wave was 40 meters (132 feet) high and 1936 was 70 meters (230 feet) high.
The film went a little out there with the size 80 meters but frighteningly it isn't outside the realm of possibility. And now there are more people in the area than there were in the past.
The 80 metre height would be a factor of the size/volume of the rock that would be expected to break off, the average time it would take to slide into, and the average cross section of the fjord at that place. This is a relatively straightforward calculation. The other avalanches occurred at other places.
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