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2022 Eruption

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The gentle slope of Mauna Loa as seen from the flanks of Mauna Kea ...

Geology and History of Mauna Loa

Mauna Loa is the largest active volcano on Earth. Mauna Loa is in the shield-building stage of Hawaiian volcanism, a period when the volcanoes grow most rapidly, adding as much as 95 percent of their ultimate volume.
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Hawaiian Volcano Observatory, Mauna Loa
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Geology and History of Mauna Loa

Mauna Loa is the largest active volcano on Earth. Mauna Loa is in the shield-building stage of Hawaiian volcanism, a period when the volcanoes grow most rapidly, adding as much as 95 percent of their ultimate volume.
Learn More
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Color photograph of shield volcano

November 27-December 10, 2022 Eruption of Mauna Loa

Mauna Loa had not erupted since 1984—its longest quiet period in recorded history.
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Hawaiian Volcano Observatory, Mauna Loa
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November 27-December 10, 2022 Eruption of Mauna Loa

Mauna Loa had not erupted since 1984—its longest quiet period in recorded history.
Learn More