The scale of energy released is the problem. Tohoku earthquake (which caused the Fukushima tsunami) released ~600 million Little Boy's worth of energy. Yeah, mo

The scale of energy released is the problem. Tohoku earthquake (which caused the Fukushima tsunami) released ~600 million Little Boy's worth of energy. Yeah, modern bombs are bigger- you'd only need a few hundred thousand Tsar Bombas to get that much energy- but still we're talking an absolutely gargantuan amount of energy. This is why no one looked at the idea until Putin needed something to threaten America with after GWB did a really stupid thing and pulled out of the ABM Treaty. And I don't believe that the official Russian sources claim it can make a tsunami, I think that's mostly propaganda.