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Natural disasters-1226606059268844-9


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it talks about the various natural disasters

Published in: Environment, Technology, Education
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Natural disasters-1226606059268844-9

  1. 1. Are we prepared?
  2. 2. What is a Natural Disaster? What’s the difference between natural disaster and natural hazard? Can we predict them? What can we do to prevent disaster? Are we in danger?
  3. 3. List of top 11 natural disasters 1. Landslides and Mudflows 2. Flood 3. Thunderstorm 4. Tsunami 5. Volcanic Eruption 6. Drought 7. Hurricane 8. Tornado 9. Wildfire 10. Earthquake 11. Avalanche
  4. 4. Landslides and mudflows
  5. 5. Landslides • Landslides are the movement of land down a slope by gravity • Landslides are mother nature’s way of redistributing land • They can be triggered by rain, floods, and earthquakes as well as man-made factors such as slope grading or mining • Landslides have the potential to happen anywhere a steep slope is present
  6. 6. Landslides • A landslide or a landslip is a movement in the ground and a shallow flow of debris. • The largest landslide in history happened because of Mount St. Helens. 3km of rock moved downhill.
  7. 7. Droughts • A drought is a long period of time in which a certain region receives a shortage of water • Lasting three years from 1958 to 1961, the Great Chinese Famine is the worst on record, 15 to 43 million were killed as a result • USA has been hit by a huge drought in 2012 decreasing corn income by 12%
  8. 8. Thunder Storms • Every Thunderstorm produces lightning • There is wet thunder and dry thunder, the difference being whether or not rain in produced • Warm humid conditions favor thunderstorms • Only 10% of thunderstorms are classified as severe • Your chance of being struck by lightning is 1 in 600,000 Multiple Lightning Strikes and a Supercell Thunderstorm formation
  9. 9. Tsunami
  10. 10. Tsunami’s • Tsunami means harbor wave and is caused by the displacement of a large body of water normally an ocean or a large lake.
  11. 11. Tsunami’s • The biggest tsunami ever happened at Lituya Bay, Alaska on July 9, 1958. The megatsunami was around 150 meters tall. • The tsunami caused by 2004 Indian Ocean earthquake, is the 6th deadliest Natural disaster in recorded history with a death toll of 230,210 – 280,000.
  12. 12. Volcanic Eruption • A volcano is an opening in a planet’s surface which allows hot magma to escape from below the surface. • Study of volcano’s is called Volcanology and volcanic eruptions are measured using Volcanic Explosivity Index
  13. 13. Volcanic Eruption • The biggest volcanic eruption was Mount Tamboraon April 10, 1815, it heard over 2000 km away and had a death toll of around 71,000. Due to the explosion 1816 became known as “The Year Without Summer”. • The largest volcano known to humans is Olympus Mons on Mars. Olympus Mons means Mount Olympus and is bigger than Mount Everest.
  14. 14. Droughts • A drought is a long period of time in which a certain region receives a shortage of water • Lasting three years from 1958 to 1961, the Great Chinese Famine is the worst on record, 15 to 43 million were killed as a result • USA has been hit by a huge drought in 2012 decreasing corn income by 12%
  15. 15. Hurricanes • A hurricane is a tropical storm with winds over 74mph • Hurricanes occupy the most intense level of the three levels of tropical storms • Hurricanes rotate or circulate counter-clockwise in the northern hemisphere • Hurricanes can only occur over the Atlantic ocean, Caribbean sea, and gulf of Mexico View of a Hurricane from Space
  16. 16. Tornados (Twisters) • A tornado is a violently rotating column of air that is touching both the ground and a cumulonimbus cloud. • Tornado conditions are caused when different temperatures and humidity meet to form thunder clouds • “Twisters” can attain speeds up to 100 miles an hour
  17. 17. Tornados • The biggest tornado recorded was the Hallam, Nebraska tornado on May 22, 2004. It was around 2.5 miles big and had a death toll of around 160. • The deadliest tornado recorded occurred in Daultipur and Salturia, Bangladesh on April 26th, 1989. 1300 recorded dead and 12,000 injured.
  18. 18. Tornados • A tornado is defined as a violently rotating column of air extending from a thunderstorm to the ground • Tornados are found in almost every part of the world • Tornados are most common in the United States, just east of the Rocky Mountains in an area called Tornado Ally • Waterspouts are weak tornados over water and can move inland and become tornados Click on Image to View a Tornado Chaser’s Video
  19. 19. Wildfire • A wildfire is any uncontrolled fire in the countryside or wilderness. • Other names for a wildfire are brush fire, bushfire, forest fire, desert fire, grass fire, hill fire, peat fire, vegetation fire, and veldfire. • One of the largest wildfire is the 1910 wildfire
  20. 20. Earthquakes • Earthquakes are caused by the release of built up pressure caused by the shifting of tectonic plates • Earthquakes usually occur on fault lines, or areas where tectonic plates meet • The size of an earthquake is measured using the logarithmic based Richter scale An aerial view of the San Andreas fault in the Carrizo Plain, Central California
  21. 21. Earthquake
  22. 22. Avalanches • Avalanches Happen on every continent • Avalanche Season is during the “winter time” or December-April in the United States • A large scale can release up to 300,000 cubic yards of snow • Avalanches are more commonly released by recreationists than by natural causes • The biggest factor of avalanche possibility is the accumulation snow over the winter season – More snow = bigger avalanche Click on Image for An Avalanche Video
  23. 23. Llaima Villarrica Antuco Descabezado Grande
  24. 24. In case of eruption.