Eyjafjallajokull is not located at a plate boundary, so its eruption was not caused by the collision of two tectonic plates. The volcano is located in Iceland, which is situated on the Mid-Atlantic Ridge, a divergent plate boundary where the North American and Eurasian plates are moving away from each other. The eruption of Eyjafjallajokull was triggered by the movement of magma from deep within the Earth along a fissure that formed in the crust, not by the collision of plates.