Noun
A hole or spot in a volcanic or other region, from which fumes issue.
Source: Webster's dictionaryRecent and ongoing projects include gravimetric and GPS-based geodetic monitoring, fumarole gas sampling, tephra distribution mapping, new interpretations of the Schriebers Meadow lava flow, and hazards analyses. Source: Internet
Today, sulfurous gases reach the surface via two fumarole pathways: Dorr Fumarole, northeast of the summit; and Sherman Crater, south of the summit. Source: Internet