Natural disasters

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Natural disasters

  1. 1. Natural disasters
  2. 2. EARTHQUAKES Earthquakes occur when the earth's tectonic plates release stress. This release of pressure creates the vibrations, which we call an earthquake, causing damage to the surrounding environment. They occur around fault lines, the places where tectonic plates meet. The intensity of earthquakes is measured on the Richter scale. EARTHQUAKES IN JAPAN. March 2011
  3. 3. 3 TSUNAMI A tsunami is a series of tremendous waves generated by a massive underwater disturbance. Tsunamis can move at speeds as high as 500 miles per hour and although typically small, they can be up to 100 feet tall.
  4. 4. 4 HURRICANE A hurricane is a destructive tropical cyclone in the western Atlantic Ocean with winds exceding 74 miles per hour. Hurricanes are usually accompanied by electrical storms and typically occur during summer and early autumn. In a mere day, a hurricane can release the amount of energy necessary to satisfy the electrical needs of the entire United States for about six months.
  5. 5. 5 TORNADO A tornado is a destructive whirling wind accompanied by a funnel-shaped cloud extending down from a cumulonumbus cloud. Tornadoes can spin at speeds up to 500 miles per hour and annihilate anything in its path in a matter of seconds.
  6. 6. 6 FLOODS A flood is caused by excess water surpassing the limits of its confines. A flood can happen during a myriad of events, including heavy rainfall and overflowing river banks. Floods present a significant danger with enough force to sweet away massive objects such as cars and trees.
  7. 7. 7 TYPHOON A variation of tropical cyclone, which is typical for the northwestern Pacific. In the central part of typhoons observed the greatest reduction of air pressure at the sea surface, reaching 650 mmHg
  8. 8. 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
  9. 9. 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
  10. 10. 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
  11. 11. THANKS FOR WATHCHING

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