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Natural Hazard

Natural Hazard . What is a natural hazard?. What is a natural hazard?. Naturally occurring event that has a detrimental effect on our surroundings Natural disaster: natural hazard that leads to financial, environmental or human loss . What is a natural hazard?. Geological Hazard.

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Natural Hazard

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  1. Natural Hazard

  2. What is a natural hazard?

  3. What is a natural hazard? • Naturally occurring event that has a detrimental effect on our surroundings • Natural disaster: natural hazard that leads to financial, environmental or human loss

  4. What is a natural hazard? • Geological Hazard

  5. What is a natural hazard? • Geological Hazard • Hydrological Hazard

  6. What is a natural hazard? • Geological Hazard • Hydrological Hazard • Meteorological Hazard

  7. What is a natural hazard? • Geological Hazard • Hydrological Hazard • Meteorological Hazard • Fires

  8. What is a natural hazard? • Geological Hazard • Hydrological Hazard • Meteorological Hazard • Fires • Health disasters

  9. What is a natural hazard? • Geological Hazard • Hydrological Hazard • Meteorological Hazard • Fires • Health disasters • Space disasters

  10. Consider. • Proximity to disaster zone • Population • Preparedness for disaster www.wikipedia.com 2011

  11. Earthquakes • Volcanic Eruptions • Tsunamis

  12. Earthquake • Earth is divided into 52 tectonic plates.

  13. Where do earthquakes happen? • Majority occur on plate boundaries. Earthquakes in the last 7 days http://earthquake.usgs.gov 2011

  14. How do they happen? • 3 Main types of faults • Pressure builds up and is released along fault lines

  15. How do they happen • 3 Main types of faults • Pressure builds up and is released along fault lines

  16. How do they happen • 3 Main types of faults • Pressure builds up and is released along fault lines

  17. Measured: • P and S waves • Primary waves • Like a slinky • Secondary waves • Ocean waves • Destructive • Richter Scale 9.1 2004 Indian ocean quake 7.0 Haiti earthquake 2010 5.4 Turkey earthquake & DC earthquake this summer

  18. Deadliest Earthquakes http://www.infoplease.com 2011

  19. What leads to destruction 5.8 Virginia 5.4 Turkey Zero Deaths 430 deaths and 1300 missing

  20. Volcanic eruptions • Along divergent plate boundaries • Hot spots

  21. Volcanic eruptions • Along divergent plate boundaries • Hot spots

  22. How to they form? • Convergent plate boundary

  23. How do they form? • Hot Spots

  24. How do they form? • Hot Spots

  25. Parts of a volcano

  26. Violent and Passive • Passive • Slow lava movement • Little ash or debris • no explosion • Predicable and slow • Not very dangerous

  27. Violent and Passive

  28. Violent and Passive • Violent volcanoes • Very dangerous • Expels noxious gases and ash

  29. Mt St. Helens May 1980 Before and after

  30. Mt St. Helens • Early March 4.2 earthquake in the area followed by a 4.0 earthquake 3 days later • From March 5th to the 25th earthquakes ever 15 hours • After about ever 3 hours • Scientist notices severe cracks forming the in the glaciers about the mountain. • Many rock falls and avalanches were observed

  31. Mt St. Helens • March 27th small eruptions where seen from the top. Ash and debris was spewing into the air. A small crater formed at the top • Small eruptions occurred from April to early May • The mountain began to bulge • As quakes and small eruptions continued the north flank bulged nearly 100m

  32. Mt St. Helens May 18th 1980 • The eruptions quieted down • 5.0 earthquake triggered a series of evernts • The area that had bulged began to give way and slid down the mountain • Violent explosions threw rocks and debris 2000m into the air. • The lateral blast was felt 23km away flattening everything in its path • Blast was 1600 times greater then the atomic bomb

  33. Mt St. Helens

  34. Mt St. Helens

  35. Mt St. Helens Weeks after the baste small eruptions took place

  36. Mt St. Helens aftermath • 57 people were killed • 200 houses were destroyed • 27 bridges • 1500 elk and 5000 deer were estimated dead • The ash in the atmosphere blocked the sun lowering the average earth temperature but 2.2 degrees over the next year

  37. Tsunami

  38. Tsunami • A large displacement of water onto the shore • They can be caused by many events • Earthquakes • Underwater explosions • Volcanoes • Meteors

  39. Tsunami

  40. Tsunami 2004 Indian Ocean Boxing day 2005

  41. 2004 Indian Ocean Tsunami • Triggered but a 9.1 Earthquake west of Indonesia

  42. 2004 Indian Ocean Tsunami Speeds from 500 kmh to 1000 kmh

  43. 2004 Indian Ocean Tsunami Before and after

  44. 2004 Indian Ocean Tsunami Before and after

  45. 2004 Indian Ocean Tsunami • 230,000 people dead • 1.69 million people displaced

  46. Questions? • Ontario is very safe!

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