User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-4775842-20120902221823/@comment-4212769-20120907120437

I have a little exhibition from "Size does not matter (too much)":

http://en.wikipedia.org/wiki/File:Stoat_killing_a_rabbit.jpg

http://www.youtube.com/watch?v=IiMhqbR41Rc

Now let's think about with what Lao Shan Lung could defend himself when a Fatalis comes from above... hmm... Exactly! Nothing! Lao Shan Lung has practically no defense patterns for something that comes from above. It can only rely on his back plating. It's only attacks are the bite, a bodyslam and the tail whip, if you want. But what Fatalis would attack Lao Shan Lung from the front, from behind or from beneath? None. Furthermore Fatalis doesn't even need to come near to it as it has a fire ball with that it could attack Lao Shan Lung that is weak to fire (and dragon element what the fire ball has also IIRC) So tell me now: Does the size matter in this scenario?

Ok, now to the actual question: My guess is that the Underwater Ruins are more or less directly beneath Moga Village/Forest. That's why the earthquakes didn't need to be very great but can still be perceived by the villagers as rather strong. IIRC there were more than one earthquake happening more or less regularly and they stopped when Ceadeus' horn(s) were broken the first time. That's why I think it could be possible but I don't know if that really happened that way.

Btw, Ceadeus is actually "only" about 56 metres long but as I said size has a role but (as an Elder Dragon) the power could still be bigger than its size would actually tell (and I'd say weight has a much bigger role for an attack like that).