Sunday, 18 May 2014

Eruption of Mount St. Helens

On May 18, 1980 a volcanic eruption occurred at Mount St. Helens 150 km south of Seattle, and 80 km northeast of Portland, Oregon. Always it was the most active volcano in the Cascade Range.

Month before 1980 eruption

It was the greatest eruption in the Contiguous States since 1915 eruption of Lassen Peak in California.

It was the deadliest and the most destructive volcanic event in the history of the United States.



A top of the volcano was changed visibly.

Mount St Helens in 2006

57 people were killed and 200 houses, 27 bridges, 25 km of railways and 300 km of highway were destroyed. Property damage was $1.1 billion.

Mount St Helens at night in 2004

Larger, longer lasting eruptions have occurred in the volcano's past and are likely to occur in the future. Although the volcano seems to have returned to a period of quiet, scientists with the U.S. Geological Survey and University of Washington Geophysics Program continue to closely monitor Mount St. Helens for signs of renewed activity.