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Understanding Flood Risks and the Eruption of Mt. St. Helens: A Quiz Review

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raanan
17 diapositives · 314 Views · Jul 20, 2014

This quiz review covers essential information about flooding in New York State and the historical eruption of Mt. St. Helens. Questions explore areas at risk for flooding, the impact of hurricanes, and preparation methods for flooding emergencies. The review also details the significant events of the Mt. St. Helens eruption on May 18, 1980, including the landslide, destruction caused, and the geological factors leading to the eruption. For a better understanding of these natural disasters, be prepared to answer quiz questions based on the materials provided.

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Understanding Flood Risks and the Eruption of Mt. St. Helens: A Quiz Review
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  1. Quiz/Review • Get out a small piece of paper and put your name on it. • When the bell rings, the quiz will begin.

  2. Question 1 • What areas in New York State are at risk for flooding?

  3. Question 2 • Has a hurricane ever hit New York State?

  4. Question 3 • What should you do to prepare for a flood?

  5. Answers • Low lying areas, near water. • Yes • Evacuation plan, food, money, Paperwork, stay informed.

  6. Mt. St. HelensLargest landslide in US history • May 18, 1980 • 46°11′28″N 122°11′40″W • Active stratavolcano

  7. Maps

  8. What is… • May 18, 1980 Mt St Helens began to erupt. • St. Helens is known for ash explosions and pyroclastic flows.

  9. Pyroclastic Flow

  10. When… • May 18,1980 • October 2004 a lava dome appeared. • Erupted 45 times previously.

  11. Time line • March 27 steam started to vent after an earthquake. • By the end of April a budge was visible. • May 18th with little warning a large earthquake, started the north slope to begin to collapse. • 3.9 million cubic yards slide down slope. • For 9 hours ash rose up to 16 miles into the sky.

  12. What causes this event? • This eruption and following landslide were pre-cursered by medium sized earthquakes. • The Juan de Fuca plate is subducting under the North American plate. • The heat from the eruption melted glaciers rapidly.

  13. Who is affected? • 57 people died • 250 homes were destroyed • 47 bridges washed out • 185 miles of highways were destroyed • The summit 9,677 ft (2,950 m) was changed to 8,365 ft (2,550 m)

  14. Possible Warning • Scientists knew with earthquake records that an eruption was possible soon. • With any eruption a major slide and flow was possible. • Evacuation plan • Plan ahead. Always have emergency supplies, food, and water stored. • Plan an evacuation route away from rivers or streams that may carry mud or debris flow.

  15. Works Cited • http://vulcan.wr.usgs.gov/Volcanoes/MSH/ • http://en.wikipedia.org/wiki/Mount_St._Helens#Geologic_history • http://gonw.about.com/od/parkswa/a/mshaffects.htm • http://vulcan.wr.usgs.gov/Volcanoes/MSH/May18/OnThisDay1980/Days/1980September14.html