"The viewing has been spectacular," especially at night and before sunrise, park spokesperson Jessica Ferracane said.

Visitors to the park are currently able to witness two eruptive events: the glow from Kilauea's lava lake and lava from a Mauna Loa fissure.

"This is a rare time where we have two eruptions happening simultaneously," Ferracane said.

Mauna Loa last erupted in 1984. The current eruption is its 34th since written history began in 1843. Its smaller neighbor, Kilauea, has been erupting since September 2021.

Officials were initially concerned that lava flowing down Mauna Loa would head toward the community of South Kona, but scientists later assured the public the eruption had migrated to a rift zone on the volcano's northeast flank and wasn't threatening communities.

The lava was flowing "not super fast" at less than 1 mph, Ken Hon, scientist-in-charge at the Hawaiian Volcano Observatory, said Tuesday. It was moving downhill about 6 miles (10 kilometers) from Saddle Road, which connects the eastern and western sides of Hawaii's Big Island.