Question: why is eyjafjallajokull a stratovolcano?
Answer: Besides ash emissions, lightning strikes and an earthquake swarm were recorded at the volcano in the 24 hours prior to the May 15 bulletin. ... Eyjafjallajökull (or Eyjafjöll) is a stratovolcano composed to alternating layers of hardened lava, solidified ash, and rocks thrown out by previous eruptions.