Additional information can be found below:
https://en.wikipedia.org/wiki/Plinian_eruption
Plinian eruptions are large explosive events that form enormous dark columns of tephra and gas high into the stratosphere (>11 km). Such eruptions are named for Pliny the Younger, who carefully described the disastrous eruption of Vesuvius in 79 A.D. Many thousands of people evacuated areas around the volcano, but about 2,000 were killed, including Pliny the Older.
https://www.usgs.gov/glossary/volcano-hazards-program-glossary
#eruption