What he said.
I should add, though, that we have WoB (=Word of Brandon) that Roshar is tectonically stable. Also, it have been suggested that Urithiru might be located somewhere unreachable through normal means, such as high up on a mountain, on an unknown/lost island west of the Rosharan super-continent or something else. Someone has also suggested that Urithiru could have been a floating/flying city. Others has taken this even further by suggesting that the Plains was shattered because the flying city of Urithiru smashed down on it.
EDIT: And by Neptune's beard, Moogle, up-vote for one of the best posts I've seen on this forum.
Also, a great and heartfelt welcome to you, Rade! Up-vote for (one of?) your first post(s)!