Several fissures shot lava into the air on Wednesday but one flow had not advanced any further toward coastal Highway 137, which remains around a mile distant, County of Hawaii Civil Defense said in a statement.
No serious injuries or deaths have been reported from the eruption, Presstv reported.
Meanwhile "ballistic blocks" the size of microwave ovens shot from Hawaii's Kilauea volcano on Wednesday in what may be the start of explosive eruptions that could spew huge ash plumes and hurl smaller rocks for miles (km), the US Geological Survey said.
Such eruptions, last seen nearly a century ago, have been a looming threat since Kilauea, one of the world's most active volcanoes, erupted nearly two weeks ago.
Ash is a new hazard for Hawaii's Big Island, already grappling with volcanic gas and lava that has destroyed 37 homes and other structures and forced the evacuation of about 2,000 residents from communities in the southeast Puna district.