Mount St Helens Fast Facts by hmv13501

VIEWS: 115 PAGES: 4

									Name: ____________________________                       Date: ______________
Homeroom: ________________________                        Period: _____________
Directions: You will use the information attached to answer the following questions.
They DO NOT need to be in complete sentences. Then write a story as if you were there.

   1. In what state is Mount Saint Helens located?
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   2. What was the date and time of the big eruption?
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   3. What was the Richter Scale rating of the earthquake that caused the
      big eruption of Mt. Saint Helens?
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   4. In which direction did Mt. Saint Helens erupt?
       ________________________________________________________
   5. How high did the dust cloud rise into the sky?
       ________________________________________________________
   6. What caused all of the flooding and mudslides?
       _______________________________________
       _______________________________________
   7. How much of the mountain was blown away?
       ________________________________________________________
   8. How far did the dust cloud reach?
       ________________________________________________________
   9. How many people were killed in the eruption?
       ________________________________________________________
   10.On the back write 1 full page (3 paragraphs) about what happened as
      if you were there when Mt. Saint Helens erupted.
           Support your information with the article and “Fast Facts”.
           Make sure you use at least 5 facts about Mount Saint Helens.
           You can make things up that might realistically have happened.
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Mount Saint Helens
           Mount St Helens Fast Facts

 Location of     MSH, an active stratovolcano (or composite volcano)
   MSH           Located in southwest Washington State, USA
Date and Time May 18th, 1980, 8:32 am.
 of Eruption  Eruption was triggered by a 5.1 earthquake centered beneath the mountain.

Height of MSH MSH was 9,677 feet before the eruption and 8,363 feet after.
(before & after) 1,314 feet was removed by the May 18th eruption.

                 The largest landslide in recorded history swept down the mountain at speeds of 70 to
   Debris        150 miles per hour and buried the North Fork of the Toutle River under an average of
  Avalanche      150 feet of debris. Some areas are covered by as much as 600 feet. In all,
                 approximately 23 square miles of material was removed from the mountain.
                 The lateral blast swept out of the north side of MSH at 300 miles per hour creating a
                 230 square mile fan shaped area of devastation reaching a distance of 17 miles from the
 Lateral Blast
                 crater. Temperatures as high as 660 degrees F and the power of 24 megatons of thermal
                 energy, it snapped 100 year old trees like toothpicks & stripped them of their bark.
                 The snow on MSH that was not instantly flashed to steam by the heat. It melted and
    Lahars
                 formed large mudflows that destroyed 27 bridges, 200 homes, 185 miles of roadway,
  (mudflows)
                 and 15 miles of railway.
  Pyroclastic    Pyroclastic flows rolled out of the crater for hours after the eruption. Covering 6 square
    Flows        miles, they sterilized the remaining soil with temperatures nearing 1,300 degrees F.
                 The massive ash cloud grew to 80,000 feet (18 kilometers) in 15 minutes and reached
     Ash         the east coast in 3 days. Although most of the ash fell within 300 miles of the mountain,
                 finer ash circled the earth in 15 days & may continue to stay in the atmosphere for yrs.

  Number of      57 people were killed as a result of the eruption. Of these, 21 bodies were never
  Fatalities     recovered from the blast zone.
                 $1.1 billion for timber, civil works and agricultural losses. This does not include money
   Damage
                 for personal property losses, the cost of ash clean-up, or the loss of tourism in the area
  Estimates
                 immediately after the eruption.
                 7,000 big game animals, 12 million Chinook and Coho salmon, and millions of birds and
   Animals
                 small mammals are believed to have died in the eruption.
                 Volcanoes provide us with geothermal energy, valuable minerals, fertile soil and
   Benefits
                 recreational opportunities.
                 MSH can't even twitch without scientist knowing about it. Seismic disturbances, gas
  Current
                 emissions, temperature, elevation changes (deformation), water levels, sediment flow
 Monitoring
                 rates, and even magma movement are all carefully monitored.
                 MSH is expected to continue erupting but no one knows for how long. Pyroclastic
    Future
                 flows, lahars, ejection of ash and pumice, and even the possibility of lava flows may all
   Behavior
                 lie somewhere in MSH's future.

								
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