Question

What were the signs that mount st Helens was going to eurupt?

Answer 1

Beginning about March 16, 1980, a series of small earthquakes occurred in the Cascades. Other than geologists, few people noticed. However, on the afternoon of March 20, 1980, a magnitude 4.2 earthquake rocked the state. Earthquake activity increased over the next few days, along with a continuous shaking called "volcano tremor." Geologists see this as a sign of magma moving underneath the volcano. Eventually, a large explosion was seen at the summit. This created a new crater, and it blew ash over a wide area. The mountain ejected steam and other material until about April 21.

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