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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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    Presentation Transcript
    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!