5. Primary Effects. There were many primary effects of the eruption, one of them being 2/3 of the island was covered in ash, causing devastation and many homes being destroyed. As a result of this 50% of the island has to be evacuated to the north side of the island. Also Plymouth the capital of the island was covered in ash and became a ghost town. Forest fires and tsunamis were caused in a result of pyroclastic flows. Farmland was destroyed as well as schools and hospitals, the airport was also closed.