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To a volcanologist, a volcano is a structure containing a vent or cluster of vents fed by magma rising directly from great depth within the earth.

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Mauna Loa last erupted in 1984. In September 2015, volcanologists raised an alert after detecting an increase in the number of shallow earthquakes near the summit and the upper Southwest Rift Zone.

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Rescue crews responded to a 7:18 p.m. alarm Sunday (Sept 20) to Mauna Loa for a lost hiker. A 42-year-old Japanese visitor got lost while hiking on the Mauna Loa trail about 1.5 miles above the Mauna Loa Solar Observatory. The man had been hiking all day, was caught in heavy rain, strong winds and […]

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This change for Mauna Loa’s status to YELLOW/ADVISORY reflects HVO’s determination that the volcano is showing persistent signs of low-level unrest.

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Scientists at the U.S. Geological Survey Hawaiian Volcano Observatory have elevated the Volcano Alert Level for Mauna Loa from NORMAL to ADVISORY.

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Does lava continue to flow exactly as it did on land or does it behave differently after it enters the ocean?

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How we use gravity to monitor volcanoes takes advantage of the knowledge that the pull of gravity is stronger when there is more mass beneath the spot where it’s measured.

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USGS Hawaiian Volcano Observatory scientists extract as much insight as possible from historic accounts of eruptions, and then combine that information with current observations.

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The recent high lava lake levels at Kīlauea Volcano have caught the attention of visitors and kama‘aina alike. But we shouldn’t forget that unrest at Mauna Loa continues.

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Continuous CO2 monitoring began on Mauna Loa in 1958, when Charles David Keeling installed state-of-the-art instrumentation high on the remote north flank of the volcano and began carefully measuring the amount of CO2 in the air.

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A look back at the 1880-1881 Mauna Loa lava flow and the threat that it posed to Hilo.

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Over the past few months, Mauna Loa, Hawai‘i Island’s largest volcano, has shown subtle signs of stirring from its 31-year-long slumber (its most recent eruption began on March 25, 1984).

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The National Weather Service in Honolulu has issued a high wind warning for Big Island summits until 4 a.m. Friday (March 13). Winds are coming from the west at 45-65 mph with gusts over 66 mph. A Winter weather advisory remains in effect for Big Island summits above 11,000 feet in elevation until 6 a.m. […]

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The National Weather Service in Honolulu has issued a winter weather advisory and high wind warning for Big Island summits until 6 p.m. this evening (March 9). Snow and ice accumulations along with freezing fog will deposit up to one inch of new snow on Big Island summits over 12,500 feet in elevation.

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