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Clear Views of Mauna Loa on Kīlauea summit overflight

Neither Kīlauea nor Mauna Loa erupted in 2019, but this period of relative quiet must not lead to complacency about Hawaii's two most active volcanoes...

Over the last two centuries, six lava flows erupted from Mauna Loa's Northeast Rift Zone and advanced toward Hilo.

A dusting of snow on Mauna Loa summit

U.S. Geological Survey trucks pull off the shoulder of Mauna Loa Observatory Road before dawn. I park the Jeep at the helicopter staging area, a flat...

Civil Air Patrol flight over Mauna Loa Summit

The USGS Hawaiian Volcano Observatory (HVO) detects tens of thousands of earthquakes each year. Currently, one of the most active areas of seismicity...

The recently published "Geologic map of the central-southeast flank of Mauna Loa volcano" is the culmination of years of field work by the U.S...

HVO rebuilds and relocates Mauna Loa gas monitoring instruments

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...