Mt. St. Helens swelling; chances of eruption grow

May 6, 1980

Scientists say the volcanic Mt. St. Helens is swelling at a rate of six feet a day, increasing the possibility of a mud slide or lava eruption. Dr. Robert Tilling, head of the US Geological Survey's volcanic-hazards program, said the bulging was "the greatest potential hazard" presented so far by the volcano.