Last updated: December 9, 2025
Place
Stop 8: Final Look
NPS/Dave Krueger
As you explored Sulphur Springs, you may have seen additional fumaroles and springs away from the path. Some have names, many don’t. Sometimes new ones just appear - or old ones disappear! Did you see any fumaroles with bright yellow crystals near the opening? The crystals are pure native sulfur deposited when hydrogen sulfide escapes the fumarole.
There are several areas within Valles Caldera National Preserve where hot springs and fumaroles occur. If you are hiking in the backcountry, you may find others.
Sulphur Springs hydrothermal system at Valles Caldera National Preserve consists of hot springs, cold springs, fumaroles, and mudpots. The hydrothermal system at Yellowstone National Park consists of hot springs, cold springs, fumaroles, mudpots and geysers. Why doesn’t Valles Caldera have geysers? Although many of the hot springs at Yellowstone are acidic, those associated with geysers are the opposite; they are alkaline. This property helps create an impermeable rock lining in the geyser plumbing that allows pressure to build up for the water eruption. All the features at Valles Caldera are acidic; none are alkaline. This, and a smaller supply of water are likely why there are no geysers here.
There are several areas within Valles Caldera National Preserve where hot springs and fumaroles occur. If you are hiking in the backcountry, you may find others.
Sulphur Springs hydrothermal system at Valles Caldera National Preserve consists of hot springs, cold springs, fumaroles, and mudpots. The hydrothermal system at Yellowstone National Park consists of hot springs, cold springs, fumaroles, mudpots and geysers. Why doesn’t Valles Caldera have geysers? Although many of the hot springs at Yellowstone are acidic, those associated with geysers are the opposite; they are alkaline. This property helps create an impermeable rock lining in the geyser plumbing that allows pressure to build up for the water eruption. All the features at Valles Caldera are acidic; none are alkaline. This, and a smaller supply of water are likely why there are no geysers here.
Mientras explorabas Sulphur Springs, es posible que hayas visto otras fumarolas y manantiales alejados del sendero. Algunos tienen nombre, pero muchos no. A veces aparecen otros nuevos, ¡o desaparecen los antiguos! ¿Has visto alguna fumarola con cristales amarillos brillantes cerca de la abertura? Los cristales son azufre puro depositado cuando el sulfuro de hidrógeno se escapa de la fumarola.
Hay varias zonas dentro de la Reserva Nacional Valles Caldera donde hay manantiales termales y fumarolas. Si realiza senderismo en zonas remotas, es posible que encuentre otras.
El sistema hidrotermal de Sulphur Springs en la Reserva Nacional Valles Caldera consta de aguas termales, manantiales fríos, fumarolas y pozos de lodo. El sistema hidrotermal del Parque Nacional de Yellowstone consta de aguas termales, manantiales fríos, fumarolas, pozos de lodo y géiseres. ¿Por qué no hay géiseres en Valles Caldera? Aunque muchas de las aguas termales de Yellowstone son ácidas, las asociadas a los géiseres son todo lo contrario: alcalinas. Esta propiedad ayuda a crear un revestimiento rocoso impermeable en las tuberías de los géiseres que permite que se acumule presión para la erupción del agua. Todas las características de Valles Caldera son ácidas; ninguna es alcalina. Esto, junto con un menor suministro de agua, es probablemente la razón por la que no hay géiseres aquí.
Descriptive Transcript
A hilly landscape of bleached gravel with steam rising from the ground in several places. These are volcanic steam vents or fumaroles.
Visit our keyboard shortcuts docs for details
- Duration:
- 10.944 seconds
Several plumes of steam emerge from the ground in the Sulphur Springs region of Valles Caldera National Preserve.