HONOLULU (AP) — Scientists in Hawaii have captured rare images of blue flames burning from cracks in the pavement as the Kilauea volcano gushes fountains of lava in the background, offering insight into a new dimension in the volcano's weeks-long eruption.

Volcanos produce methane when hot lava buries and burns plants and trees. The gas flows through the ground and up through existing cracks.

"It's very dramatic. It's very eerie," Jim Kauahikaua, a U.S. Geological Survey scientist, told reporters.

PAHOA, HI - MAY 23: Blue flames of methane gas escape from a crack near a Kilauea volcano fissure in Leilani Estates, on Hawaii's Big Island, on May 23, 2018 in Pahoa, Hawaii. Officials are concerned that 'laze', a dangerous product produced when hot lava hits cool ocean water, will affect residents. Laze, a word combination of lava and haze, contains hydrochloric acid steam along with volcanic glass particles. (Photo by Mario Tama/Getty Images)

He said it was only the second time he's ever seen blue flames during an eruption.

The methane can seep through cracks several feet away from the lava. It can also cause explosions when it's ignited while trapped underground. These blasts can toss blocks several feet away, said Wendy Stovall, also a scientist at the Geological Survey.

Hawaii County has ordered about 2,000 people to evacuate from Leilani Estates and surrounding neighborhoods since the eruption began on May 3.

PAHOA, HI - MAY 23: Lava erupts from a Kilauea volcano fissure (L) as people gather on a residential street in Leilani Gardens, on Hawaii's Big Island, on May 23, 2018 in Pahoa, Hawaii. Officials are concerned that 'laze', a dangerous product produced when hot lava hits cool ocean water, will affect residents. Laze, a word combination of lava and haze, contains hydrochloric acid steam along with volcanic glass particles. (Photo by Mario Tama/Getty Images)

The volcano has opened more than 20 vents in the ground that have released lava, sulfur dioxide and steam. The lava has been pouring down the flank of the volcano and into the ocean miles away.

The eruption has destroyed 50 buildings, including about two dozen homes. One person was seriously injured after being hit by a flying piece of lava.

Stovall said lava spatter from one vent was forming a wall that was helping protect a nearby geothermal plant.

KAPOHO, HI - MAY 20: Lava from a Kilauea volcano fissure erupts on Hawaii's Big Island on May 20, 2018 in Kapoho, Hawaii. The U.S. Geological Survey said the volcano erupted explosively on May 17 launching a plume about 30,000 feet into the sky. (Photo by Mario Tama/Getty Images)

Lava from that vent was shooting further into the air and producing the highest lava wall of all the vents, which was blocking molten rock from flowing north toward the plant.

Officials shut down Puna Geothermal shortly after the eruption began.

On Tuesday, officials finished stabilizing wells that bring up hot liquid and steam to feed a turbine generator. A team from the Hawaii Emergency Management Agency and the company continued Wednesday to plug the wells to make sure the fluid inside doesn't move from one part of the well to the other, said Janet Snyder, a spokeswoman for Hawaii County.

Earlier this month officials removed a flammable gas called pentane from the plant to reduce the chance of explosions.

HAWAII VOLCANOES NATIONAL PARK, HI - MAY 15: People play golf as an ash plume rises in the distance from the Kilauea volcano on Hawaii's Big Island on May 15, 2018 in Hawaii Volcanoes National Park, Hawaii. The U.S. Geological Survey said a recent lowering of the lava lake at the volcano's Halemaumau crater 'has raised the potential for explosive eruptions' at the volcano. (Photo by Mario Tama/Getty Images)

Tourism officials cheered news that a Norwegian Cruise Lines ship that tours the Hawaiian Islands would resume stopping in Kailua-Kona next week. Businesses catering to tourists on the cruise have been hurt since the company suspended Big Island port visits after the eruption began.

The company said it would resume calling on Hilo, a town on the eastern side of the island closer to the lava, when conditions allow.