Quote Originally Posted by P.E.N.G.U.I.N.
Yes it would, Friendowl. Noise is caused by the vibration of anything longitudinally. Shake your hand back and forth really hard but in a large arc. You just made a deafening noise even though you couldn't hear it. So, if a tree falls down and it vibrates from the impact which vibrates the air around it, it makes a sound. Even if there was no one there to hear it.
Actually, until it comes into contact with and is interpreted by an eardrum, it would simply be a vibration, and not technically a sound, right?

Point being, the cause of a sound is irrelevant. The fact that it's heard is what makes it a sound.