Mike Whybark has a great post up looking at the current frenzy over Mt. St. Helens — and the potential costs of that frenzy.
So, let’s review. Large numbers of people are traveling to a location near the geographic center of a massive prior eruption’s blast zone. Scientists caution that while they don’t expect an eruption on the scale of the previous one, they are by no means certain, and their interpretation can change at any time. The mountain is growing rapidly. The shape of the crater from the previous eruption would direct a large blast directly at the visitors.
Well worth reading.