Volcanoes by FlaxmanR

Question 7

One type of volcanic eruption, in which columns of gas and ash extend into the stratosphere and large quantities of pumice are ejected, is named for an uncle and nephew associated with the 79 AD eruption of Mount Vesuvius, which featured those characteristics. The elder man died trying to help a friend escape the eruption while the younger wrote two letters to the historian Tacitus describing the event. By what single name are both men typically known?