description Long Valley Caldera fumaroles Overview
The Long Valley Caldera fumaroles are hot gas vents in the hydrothermal system of eastern California. The caldera formed about 760,000 years ago during the eruption that produced the Bishop Tuff, and its present volcanic system includes fumaroles, hot springs, deformation, seismicity and carbon-dioxide emissions; the U.S. Geological Survey monitors these signals for changes in volcanic unrest. [U.S.
Geological Survey](https://www.usgs.gov/volcanoes/long-valley-caldera)
help Long Valley Caldera fumaroles FAQ
What is the Long Valley Caldera?
Long Valley Caldera is a volcanic depression in eastern California. It formed about 760,000 years ago during the eruption that produced the Bishop Tuff.
What are the fumaroles at Long Valley Caldera?
The fumaroles are hot gas vents connected to the caldera's hydrothermal system. They release steam and volcanic gases near other features such as hot springs.
Is Long Valley Caldera still volcanically active?
Yes, the modern system includes fumaroles, hot springs, ground deformation and earthquakes. These features show that heat and fluids remain active beneath the caldera.
Where are the Long Valley Caldera fumaroles located?
They are in the Long Valley volcanic region of eastern California, near the Sierra Nevada. The fumaroles form part of a broader hydrothermal landscape created by the caldera's ancient volcanic system.
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