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 ...

The fissure measures about 1,000 feet long, officials said. The U.S. Geological Survey’s Hawaiian Volcano Observatory said new fissures, ground deformation and abundant volcanic gases indicate ...