11. This eruption has a volcanic explosivity index of 2, and was observed by a merchant ship. 12. About 150, 000 years ago, a much larger explosive eruption occurred, probably of Volcanic Explosivity Index 5. 13. All known eruptions at the volcano have had a Volcanic Explosivity Index ( VEI ) of 3. 14. It therefore is classed as having a Volcanic Explosivity Index ( VEI ) of 1 or 2. 15. Mashk volcano is rated with a Volcanic Explosivity Index of 6, the second highest among large volcanoes. 16. For the 2010 30 period an eruption of Volcanic Explosivity Index 2 or more is expected based on statistics. 17. The eruption has a volcanic explosivity index of 7, making it one of the largest eruptions of the Holocene. 18. Tectonic earthquakes began early in January, resulting in an explosive Volcanic Explosivity Index 3 eruption later in that day. 19. It was rated 7, the highest score for a historical eruption, in the Smithsonian Global Volcanism Program's Volcanic Explosivity Index . 20. The last major eruption on Galunggung was in 1982, which had a Volcanic Explosivity Index of 4 and killed 35 people.
