VEI meaning in Earth Science ?

Answer: What is Volcanic Explosivity Index mean?

The Volcanic Explosivity Index (VEI) is a relative measure of the explosiveness of volcanic eruptions. It was devised by Chris Newhall of the United States Geological Survey and Stephen Self at the University of Hawaii in 1982.

Volume of products, eruption cloud height, and qualitative observations (using terms ranging from "gentle" to "mega-colossal") are used to determine the explosivity value. The scale is open-ended with the largest eruptions in history given a magnitude of 8. A value of 0 is given for non-explosive eruptions, defined as less than 10,000 m3 (350,000 cu ft) of tephra ejected; and 8 representing a mega-colossal explosive eruption that can eject 1.0×1012 m3 (240 cubic miles) of tephra and have a cloud column height of over 20 km (66,000 ft). The scale is logarithmic, with each interval on the scale representing a tenfold increase in observed ejecta criteria, with the exception of between VEI-0, VEI-1 and VEI-2.

reference

Full Form	Category
Visionary Enterprises Inc	Business
Visual Entertainment Inc	Business
Vagabond Entertainment Inc	Business
Vista Energy Resources, Inc.	Business
Virtually Everything, Inc.	Business
Vending Equipment Interface	Business
VESA Enterprises, Inc.	Business
Visual Effects, Inc.	Business
Vision Eye Institute Limited	Business
Volcanic Explosivity Index	Earth Science
Virtual Enterprises International	General
Vesuvius Eruption Index	General
Volcano Explosivity Index	General
Vehicle Explorer Interface	General
Vehicle Emissions Inspection	General
Vtec Economy Injection	General
Vehicle Electronics Interface	General
Vehicle Efficiency Incentive	General
Vehicle Enhancement Inc.	General
Vehicle Evaluation and Improvement	General
Virginia Executive Institute	Governmental
Virginia Eye Institute	Governmental
Virtual Edge Institute	Governmental
VELLIYANI	Indian Railway Station
Vehicle End Item	Space Science