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1975 Short-lived Eruption

By Mauna Loa
Mauna Loa 1975 eruption. Lava fountains up to 20 m (65 ft) high eru...
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Mauna Loa 1975 eruption. Lava fountains up to 20 m (65 ft) high erupted from fissures on the north flank of the volcano early Sunday morning, July 6, 1975.(Public domain.)

Following 25 years of slumber, Mauna Loa awoke with a spectacular, but short-lived, eruption just before midnight on July 5, 1975. Lava fountains erupted from fissures extending across the length of Moku‘āweoweo, Mauna Loa's summit caldera, and into the upper ends of the volcano's Northeast and Southwest Rift Zones. After only 6 hours, activity in the caldera and on the Southwest Rift Zone ended, but lava fountaining continued along the Northeast Rift Zone until 7:30 p.m. on July 6, when all activity ceased.

See the table summarizing Mauna Loa activity over the past ~200 years here.