|Old fumaroles at Sulphur Works|
A couple videos on YouTube (2007, 2010) show the old vent steaming away, and the first one shows just how pockmarked that little hill was with fumaroles!
|Active fumarole surrounded by large orange circle|
|Close up of the active fumarole|
|My video of the active fumarole|
“Hot Water” in Lassen Volcanic National Park—Fumaroles, Steaming Ground, and Boiling Mudpots - U.S. Geological Survey
Explore the Hydrothermal Areas - Lassen Volcanic National Park