>>63861053
>>63857080
I think its more around missile shape and versitility: earthquake bombs are fat and huge to pack a big boom (pic), bunker busters need to be svelte and narrow to penetrate the concrete. Once the early bunker busters were successful the earthquake bomb model simply got phased out and forgotten. I don't see any reason why it couldn't be revived if concrete has now developed to be practically impenetrable to missiles. Make sense from a tactics point of view: avoid the strongpoints, if the concrete can't be breached, then breach the weakpoints, which is the earth the concrete sits within. The earthquake bomb turns the surrounding earth into an empty cavern, which your perfect concrete bubble collapses into.