On volcanoes, a fissure is an elongated fracture or crack at the surface from which lava erupts. Fissure eruptions typically dwindle to a central vent after a period of hours or days. Occasionally ...

As seismic activity within the volcano increases ... a large elongated fissure or fracture (as seen on the diagram above) or a tiny ground crack. Nyiragongo is notorious for releasing large ...

REYKJAVIK, Iceland--Steam and lava spurted Monday from a new fissure at an Icelandic volcano that began erupting last month, prompting the evacuation of hundreds of hikers who had come to see the ...