11. A large eruption occurred early during the Holocene which reached a volcanic explosivity index of 6. 12. Volcanic Explosivity Index ( VEI ) values for events in the Miocene epoch sometimes lack references. 13. It therefore is classed as having a Volcanic Explosivity Index ( VEI ) of 1 or 2. 14. All known eruptions at the volcano have had a Volcanic Explosivity Index ( VEI ) of 3. 15. This eruption has a volcanic explosivity index of 2, and was observed by a merchant ship. 16. Mashk volcano is rated with a Volcanic Explosivity Index of 6, the second highest among large volcanoes. 17. According to the Volcanic Explosivity Index, Plinian eruptions have a VEI of 4, 5 or 6. 18. For the 2010 30 period an eruption of Volcanic Explosivity Index 2 or more is expected based on statistics. 19. About 150, 000 years ago, a much larger explosive eruption occurred, probably of Volcanic Explosivity Index 5. 20. Tectonic earthquakes began early in January, resulting in an explosive Volcanic Explosivity Index 3 eruption later in that day.
