Hawaiian Volcano Observatory

Photo Information

Lava fountains erupt from fissures on upper northeast rift zone, Mauna Loa Volcano
Photograph by J.D. Griggs at 6:24 a.m. HST on March 25, 1984.

Lava fountains erupt along enechelon fissures on the northeast rift zone of Mauna Loa Volcano. Pohaku Hanalei cinder-spatter cone (upper left) is located about 3.2 km NE from the north edge of the caldera rim. Eruption rates were as high as 2.9 million m3 per hour during the first 6 hours of the eruption, then diminished to about 0.5 million m3 per hour for the next 12 days. Sizable pahoehoe flows formed only during the first day of the eruption and within a few kilometers of the vents; at greater distances from the vents, pahoehoe lava changed into `a`a.

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Updated: 6 July 1998