People around the world have been transfixed by images of fountains of red and orange lava oozing out of volcanic vents on Hawaii's Big Island. Now blue has joined the mix: the blue flames of ...

Hawaii’s Kilauea volcano is causing eerie blue flames as hot lava burns vegetation on the Big Island. The U.S. Geological Survey has posted footage of the strange blue burning flames on its ...

The Blue Fire Crater, as it is sometimes called, isn't lava, but combusting sulfuric gas. The gas works its way through fissures to the surface, emerging at high pressure and extreme temperatures ...

For several years Paris-based photographer Olivier Grunewald has been documenting the Kawah Ijen volcano in Indonesia, where dazzling, electric-blue fire can often be seen streaming down the ...

But the effect is actually caused by sulphuric gas, which works its way to the surface, where it is heated by the lava flow. Temperatures inside the crater reach more than 500C causing the gas to ...

The phenomenon, known locally as Api Biru (Blue Fire), is caused by the combustion of sulfuric gases escaping from the volcano’s fumaroles at extreme temperatures—reaching up to 600°C (1,100°F).

Blue flames join the lava light show. People around the world have been transfixed by images of red and orange lava fountains oozing out of volcanic vents on Hawaii’s Big Island.