Volcanic unrest at Mauna Loa, Earth's largest active volcano(1/2)

Aerial view looking north-northeast toward the summit area of Mauna Loa volcano (elevation 4,169 meters) on Jan. 15, 1976. The summit caldera (Moku’āweoweo) is 6 kilometers long and 2.5 kilometers wide. The pit crater in the foreground marks the start of the Southwest Rift Zone. (Photo/Agencies)

Photo shows the 1984 eruption of Mauna Loa. Mauna Loa tends to erupt large, fast-moving lava flows. (Photo/Agencies)