Lava continued to flow from a set of fissures east of Pu'u O'o crater on Kilauea volcano, Hawaii, one of the world's most active volcanoes, scientists said.
Molten rock began oozing in the remote area known as the east rift zone, on the Big Island of Hawaii, on Saturday for the first time in 15 years.
Scientists have set up a Webcam in the area, but visibility has been poor because of the weather, with the best view available from the air.
A few glimpses overnight showed lava feeding channelled flows and a lava pond at the far eastern edge of the flows, the U.S. Geological Survey's Hawaiian Volcano Observatory said.
A scientist at the observatory said on Monday that it was a low energy eruption and he was not sure how long the volcano would continue to erupt.
He added that the flow posed no danger to wildlife since it was covering ground already covered by older flows.
The lava formed three ponds about 3 yards (2.74 metres) to 5 yards (4.57 metres) high and 100 yards (91.41 metres) wide.
Ponds are typically formed when lava slowly moves to the surface, as opposed to vigorous activity that will move lava away from a vent.
The eruption, along a one-mile (1.6-kilometre) long line of fissures, is occurring within the state's Kahaualea Natural Area Reserve.
It is the first time lava has erupted east of Pu'u O'o since February 7, 1992.