Eruption History
The last time Mauna Loa erupted was March 25, 1984. Before the last eruption, volcanologists counted thirty-three from 1843-1984. The eruption started in the caldera. Before it erupted, lots of earthquakes were happening undet the volcano.. The duration of the eruption was from March 25 to April 15, 1984. The runny lava did not reach Hilo, a city near Mauna Loa, but it was a close call. Damage from the smoke from vegetation, loud explosions from methane gas, and the intense glow at night were negative affects. Click the button below to find out about rock information. At the bottom of the page, watch a YouTube video of Mauna Loa eruption from a past news report.