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An early morning view looking north across Moku‘āweoweo, Mauna Loa's summit caldera, from a spot near the summit cabin on the volcano's south caldera...

"Volcano Watch," weekly articles written primarily by U.S. Geological Survey Hawaiian Volcano Observatory (HVO) staff and occasionally by USGS...

Halema‘uma‘u water pond

Yellowstone National park hosts more than 10,000 hydrothermal features including hot springs, geysers, fumaroles, and mud pots. But did you know that...

Continued slow rise of water level at bottom of Halema‘uma‘u

More photographs of the lower East Rift Zone flow field from Thursday overflight

Kīlauea summit

Overflight of Kīlauea summit

The pali (cliffs) of Kīlauea's south flank are some of the volcano's most striking features. Reaching up to 500 m (1500 ft) high, they stand out...

Halema‘uma‘u water pond on August 27