sozobe wrote:One thing I still haven't figured out -- combination of truly awful connection lately and limited time to try the connection lottery -- is whether those waves were superhuman heights or if they were amazingly STRONG and destructive because of horizontal force/ velocity but not necessarily height.
Both. Very strong and fast (700 km/h?), but a relatively low wave, as long as the ocean remains deep. As the wave approaches lower depths near the shore, the sheer velocity of it, confronted with ever less space for the water, forces the wave up higher & higher, up to 2, 5, 10 meters high, depending on how far out from the epicentre we're talking.
It looks weird on pictures because its not like ferociously rolling waves, but more like a swelling of the sea. So not big foamy crests rolling over each other as in a storm, but just the regular sea surface suddenly swelling up by x meters high. I saw it described as spring tide coming in - just all at once in two minutes.
Eyewitness accounts seem to differ much on the sound of it - some speak about enormous noise, others about the wave sliding in suddenly in an eerie quiet, or there being a whistling buzz or whizzing sound announcing its arrival from afar ...
Also different from a storm, I guess, is that its just the one wave, from what I understood - then nothing, after the sea retreats, then - two minutes later, ten minutes later, or half an
hour later, another one. Some image in a newspaper pictured it as ripples emanating from the epicentre over the surface of the ocean, and that seems to be how it works kinda ... hence all the people, not knowing what the **** a tsunami is, going back to the beach after the first wave, to watch what just happened there or pick up all the fish that were thrown ashore - and then, ten minutes later, being overtaken by a new wave.
I'm no expert mind you, just reading the papers ...