Other slides in this set
Mount St Helens was dormant for
Volcanic activity had been building
since 20 March, an earthquake of
4.0 was recorded. The volcano was
being monitored carefully...
27 March, there was a small
eruption of steam and gas...
A huge bulge appeared on the
North side of Mt. St. Helens by
May. The bulge grew 1.5m a day.