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Video shows Moku‘āweoweo, the caldera at the summit of Mauna Loa, during a routine overflight. 

One year ago, activity on Kīlauea Volcano was remarkably different than it is today. Lava was flowing toward the sea, robust ocean entry plumes were...

Sunny weather at Kīlauea summit, no significant changes

On July 2, HVO raised the Volcano Alert Level for Mauna Loa from "Normal" to "Advisory".

Shortly before midnight on July 5, 1975, Mauna Loa Volcano awakened with a shudder. Quickly responding to a seismic earthquake/tremor alarm at 11:18 p...

Hawaii residents are likely familiar with the Volcano Activity Updates that the Hawaiian Volcano Observatory (HVO) issues for Kīlauea and other active...

Kīlauea Volcano, on the Island of Hawai‘i, has two rift zones. The East Rift Zone is longer, with 50 km (about 31 miles) on land plus another 80 km...

HVO geologists make field observations in the lower East Rift Zone

Collecting gas samples at Sulphur Banks

Since the early 1990s, scientists have used radar satellites to map movement, or deformation, of Earth’s surface. Interferometric Synthetic Aperture...