Vulcanian
Concise Oxford English Dictionary © 2008 Oxford University Press:
Vulcanian /vʌlˈkeɪnɪən/
▶adjective Geology relating to or denoting a type of volcanic eruption marked by periodic explosive events.
– origin early 20th cent.: from Vulcano, the name of a volcano in the Lipari Islands, Italy, + -ian.
'Vulcanian' also found in these Oxford entries:

