Hawaii is bracing itself for a possibly explosive volcanic eruption.

Since Saturday, two lava fissures have opened up on Hawaii's Big Island in the vicinity of a geothermal energy plant.

Just hours after the first fissure opened up on Saturday morning, red and black lava had piled up about 40 feet high and more than 150 feet in length, while magma chunks sprayed up to 100 feet in the air, Reuters reported.