The Hawaii Volcano Observatory said the explosion within Kilauea’s Halemaumau crater had produced a volcanic cloud that reached as high as 30,000 feet (9,000 meters) and was drifting downwind to the northeast.
The observatory said residents living along the path of the ash plume should take shelter, and maintained a code red aviation alert signaled on Tuesday, meaning no air traffic was permitted in the area.
“At any time, activity may again become more explosive, increasing the intensity of ash production and producing ballistic projectiles near the vent,” it said in a statement.
Kilauea is one of the most active volcanoes in the world and one of five on Hawaii’s Big Island.
It started erupting on May 3, prompting some 2,000 people to flee from their mountainside homes.