The 1942 eruption of Mauna Loa, Hawaii

Abstract
On April 26, eruption occurred in and near Mokuaweoweo, and on April 28 at 9,200 ft on the northeast rift. For a few hours, lava gushed forth in a nearly continuous curtain of fountains a mile long; subsequently, the fountains were restricted to a single vent where they built a cone. Another outbreak, at 7,800 ft, was probably fed by an old lava tube. The original flow came within 10 mi of Hilo when a new flow broke out from the feeding channel, at which point movement on the first flow stopped. The eruption ended on May 10. Bombing of the flow was not credited with stopping the eruption. Macdonald describes accretionary lava balls associated with the flow and quotes a letter from Brun to the superintendent of Hawaii Volcanoes National Park that correctly forecasts the eruption several weeks before it happened. He concludes by discussing the effectiveness of bombing in diverting lava flows.