The Global Volcanism Program has assigned a volcanic explosivity index ( VEI ) to all of Mount Etna's eruptions since January 1955.
22.
It threw about 7.3 km 3 of volcanic rock into the atmosphere, placing its Volcanic Explosivity Index ( VEI ) at 5.
23.
His descriptions of these eruptions became the basis for two indices in the Volcanic Explosivity Index : 1-Strombolian eruption, and 2-Vulcanian eruption.
24.
This eruption is the most significant eruption of Lascar in the last 9, 000 years, with a volcanic explosivity index of 4.
25.
Prior eruptions have had a Volcanic Explosivity Index ( VEI ) of between 4 and 6 on a scale of 0 to 8.
26.
Such calderas are usually formed by large cataclysmic eruptions reaching 7 on the Volcanic Explosivity Index ( described as " super-colossal " ).
27.
The Volcanic Explosivity Index ( VEI ) Alert Level was raised to 2 ( on a scale of 1 4 ) on 2 May 2010.
28.
The weakest are Volcanic Explosivity Index ( VEI ), an order of magnitude scale ranging from 0 to 8 that often correlates to eruptive types.
29.
The total mass of the erupted material ( including magma ) was 35 million metric tons The eruption reached 3 on the Volcanic Explosivity Index.
30.
The Volcanic Explosivity Index ( VEI ) is used to quantify the amount of ejected material with a VEI-7 coming in at 100 km 3.
