More Mt. St. Helens

The Seattle Times: Local News: One or two earthquakes a minute occurring at Mount St. Helens

Here is another article. And the best part below:

On Monday, a helicopter lowered geophysicist Michael Lisowski onto the lava dome to replace a failed instrument used to measure tiny movements that indicate whether the dome is swelling, Winn said.

While the chopper was near the dome, the pilot was in constant radio contact with geophysicist Bobbie Myers, the observatory's aircraft manager, who during the 1980 blast learned to detect subtle changes in seismic monitors.

"She's known to be able to predict explosive events up to a couple of minutes ahead of time," Winn said, who confessed to being a nervous wreck while the device was being swapped out.