Mauna Loa's 1975 eruption in terms of today's Volcano Alert Level

Detailed Description
As the sun rose above Mauna Kea (background) on July 6, 1975, eruptive fissures along the Northeast Rift Zone of Mauna Loa fed voluminous ‘a‘ā lava flows that quickly moved down the north flank of the volcano. USGS photo by D. Peterson.
Sources/Usage
Public Domain.