30 years after Mount St. Helens blew, the volcano reveals its secrets
By Joe Rojas-Burke, The Oregonian
May 14, 2010, 4:42PM
A sudden series of earthquakes at Mount St. Helens caught scientists by surprise in March 1980. Less than a week after the quakes began, a blast of steam and ash opened a small crater at the summit of the reawakening volcano.Geologists didn't know enough to give public safety officials a clear picture of the danger.
"They wanted us to tell them what the earthquakes meant, and I had no idea," says Steve Malone, the University of Washington professor who led the seismic monitoring. "All I could tell them was there's a lot of earthquakes, and something's coming."
At 8:32 a.m. May 18, 1980, a magnitude 5.1 earthquake triggered an enormous landslide. The entire north side of the mountain collapsed, releasing a