The blue flames were observed in cracks on Kahukai Street in the Leilani Estates Subdivision.
The methane can seep through cracks several feet away from the lava.
"It's very dramatic. It's very eerie", Jim Kauahikaua, a USGS scientist, told the Associated Press.
The Kilauea volcano erupted three weeks ago in Hawaii, and between the gushing lava, ash and toxic gas, it's a never-ending nightmare for Lower Puna residents. "It's the first time, maybe the second time I've seen the blue flames thing".
Unless you've been living under a volcanic plug, you know that Hawaii Volcanoes National Park, a popular tourist destination, has been closed on the Big Island since the Kilauea volcano began hawking lava loogies earlier this month.
There are now three lava flows entering the ocean between Pohoiki Bay and MacKenzie State Park (Highway 137 mile markers 12 to 14). The remarkable footage was taken May 22 in the vicinity of the Puna Geothermal Venture, a plant that brings steam to the surface by way of several underground wells.
Kilauea Volcano's channelized lava flowed toward the ocean entry on Wednesday.
"We are kind of in this steady state", said Wendy Stovall, a scientist at the US Geographical Survey.
Some residents in Hawaii's Big Island are standing their ground against the fury of the Kilauea volcano as they try to protect their properties and their lives.
Joe Kekedi takes pictures as lava enters the ocean, generating plumes of steam near Pahoa, Hawaii. Lava from the Kilauea volcano is hitting the Pacific Ocean and it's sending laze, a risky combination of hydrochloric acid and glass particles, into the air.
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. But in communities like Leilani Estates, fountains of nearby lava threaten more homes and there are also spots where officials worry about widening cracks.
"It hit him on the shin and shattered everything there down on his leg", County of Hawaii government spokeswoman Janet Snyder said. Ormat is traded on the New York Stock Exchange, and shares have fallen almost 10 percent since Kilauea began erupting.
The preparations came as a third lava flow from Kilauea streamed into the ocean on Thursday.