1. The Eruption of Mount St. Helens
Before
After
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2. Mount St. Helens was a beautiful place to hike, camp, and enjoy
. Mount St. Helens was a beautiful place to hike, camp, and enjoy. It was considered one of the most symmetrical mountains in the Cascade range.
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3. The first indication that the volcano was awakening was a series of earthquakes. The first quake was on March 20, Then many other quakes followed. It was hard to tell when one was finished and another began.
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4. Small explosions began on March 27 which blew out ash and steam
Small explosions began on March 27 which blew out ash and steam. The snowy mountain top looked dirty.
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5. On the north side of the mountain, a bulge began to grow
On the north side of the mountain, a bulge began to grow. It was bulging five to six feet higher each day.
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6. On May 18, 1980, the mountain’s bulge suddenly blew.
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7. The blast was caused by an earthquake which opened a crack in the bulge, letting in air to the superheated water inside the mountain. The water exploded into steam instantly, blasting off 1200 feet of the top and north side of the mountain. The force of the blast blew down and scorched 150 square miles of forest.

8. Notice the two men in the circle to get an idea of how huge the trees were.
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9. Next, the loosened rock and mud of the mountain slid down into Spirit Lake and the Toutle River valley.
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10. The volcano then spewed ash, pumice, and gas into the sky
The volcano then spewed ash, pumice, and gas into the sky. It traveled eastward on the wind and made one town eighty miles away so dark that the street lights turned on during the day.
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11. By the end of May 18, countless lives of animals and plants had lost their lives, including 57 people. The volcano presently continues to have much less dramatic eruptions.
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12. References Pictures for the presentation can be found at these websites.
Liontracks
Before and after photograph
Mount St. Helens August 18, 2003 from Hopkins Hill Viewpoint
Before photographs: a year before and one day before
Mount St. Helens Precursory Activity
Seismic chart
Bulging mountain photograph
Predicting Volcanic Eruptions by Helen Stewart
Exploding volcano
USGS Aftermath
Downed trees
USGS Photo by T. J. Casadevalt
Mudslide view
Sudden Destruction in May
Eruption after blast
Dokumentation uber den Ausbruch des Mount St. Helens
Peacefully steaming after 1980