World's largest acidic geyser erupts again in Yellowstone after years of silence
KTVQ • • science
Key Points:
- Echinus Geyser, the world's largest acidic geyser in Yellowstone's Norris Geyser Basin, has resumed erupting after more than five years of dormancy.
- The geyser's acidic water, similar in strength to orange juice or vinegar, creates unique red formations and spiny rocks around its pool without eroding the surrounding stone.
- Historically, Echinus erupted frequently in the late 20th century, with eruptions reaching up to 75 feet and sometimes occurring horizontally, but activity declined significantly in the early 2000s.
- After sporadic eruptions between 2010 and 2017, the geyser was mostly inactive until February 2026, when it began erupting regularly again
