noun
volcanologist; vulcanologist
A scientist who studies volcanoes and volcanic phenomena.
彼は有名な火山学者です。
He is a famous volcanologist.
火山学者たちは噴火の予測に取り組んでいる。
Volcanologists are working on predicting eruptions.
火山学 is the field of volcanology, while 火山学者 refers to a person who studies it.
Compound of 火山 (volcano) + 学者 (scholar, scientist).