Mt.St Helens

By: Caroline Westbrook and Sarah Kim

Destruction of Mount St. Helens

The forests around Mt. St Helens were completely stripped. Everything in a eight mile range was destroyed instantly! 57 people were killed and 200 homes were destroyed. Railroads and roads were left in pieces and sewage systems were clogged with ash. Mt. St Helens eruption was the most destructive in U.S History!

Specks about the Eruption

Mount St. Helens was a Stratovolcano and it was 2,549 miles in elevation. Its last eruption was in 2008. Mt. St Helens' latitude was 46.2 degrees north and its longitude was 122.2 degrees west. Helens earliest eruption recorded was in 1831 and it has erupted 5 times in the 20th century.

Parts of Mount St. Helens (stratovolcano)

There are 4 main parts of a Stratovolcano. There is the Pluton and the Pipe, which are near the bottom of the volcano. There are alternating levels of lava and pyroclastic material. At the top of the volcano their is the crater.

Small Reasons Mount St. Helens Erupted

One day before the eruption, on the northeast side of the Mount St. Helens, the volcano bulged out almost 450 ft.! Another reason the volcano could have exploded is their were minor earthquakes.

Effects on the Ecosystem

Everything in the path of the ash and rock from the volcano was destroyed. Homes were crushed, roads were destroyed, and the forests around the volcano were stripped. Wildlife was gone and so were every animal that flew in the air.

Instruments used to Predict Eruptions

Seismometers Satellite Imagers




VIF, EM-31

Interesting Fact

The eruption of Mount St Helens was a VEL=5 event!

Intersesting Fact

Helens eruption was followed by two month series of earthquakes!

Intersesting Fact

Mt St Helens is now a Historical Monument