One who is skilled in, professes or practices volcanology.
2006, “A submerged island discovered off the coast of Sicily forms part of a vast underwater volcano, according to new research unveiled by Italian volcanoligists”, in Weekend Argus 24 June 2006.:
2025 August 19, Julia Jacobo, “Mile-deep underwater volcano off West Coast could erupt soon, scientists say”, in ABC News[1]:
An underwater volcano off the coast of Oregon is gearing up for an eruption, according to volcanologists who are monitoring for activity.