Earthquake employed "Sensur-round Sound" or something like that, so that you were actually supposed to "feel" the earthquake while you were watching. I honestly don't remember if it actually worked, but I do remember that it was quite loud.
I remember something similar when i went to see "BATTLE OF THE MIDWAY" at the cinema as a young chap. When the planes started their engines,the sound reverberated around the cinema and i nearly shit myself!!
Nearly,not quite
