natural disasters


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natural disasters

  1. 1. Natural Disasters are disasters that occur in this world naturally.Natural disasters can happen at any location at any time throughout the universe.Natural disasters can destroy cities, or sometimes a whole country if it is that severe.They can occur on land, in the water, and with the weather.
  2. 2. The World is always changing.Natural disasters are changes which areso great they may cause damage to theshape of the land or to the lives of peopleand other living things.Great changes happen deep inside theEarth and on its surface. The changes onthe outer part of the Earth happenbecause of different kinds of weather.
  3. 3.  Avalanche Earthquakes Tornados Cyclone
  4. 4. An Avalanche is a movement of snow, ice androck down a mountainside. Avalanches happenvery suddenly and can move as fast as a racingcar up to 124mph.Avalanches can be caused by – snow melting quickly snow freezing, melting then freezing again someone skiing a loud noise or an earth tremor
  5. 5.  a falling mass of snow and/or ice a mass-wasting process › analogous to debris flows or mudslides a natural hazard - threat to life and property an expression of earth system complexity
  6. 6.  recreation › ski areas › backcountry transportation › highways › railroads communities/structures avalanches are cool Westwide Avalanche Network
  7. 7.  loose snow (point release) slab › soft slab › hard slab distinction based on snow cohesiveness can be wet or dry snow
  8. 8. Starting zone TrackRunout zone
  9. 9.  addition of mass to the snowpack rate of addition is important stress vs. strength θ compression gravity θ
  10. 10.  changes in temperature can affect snow stability › change during storms › rapid warming › metamorphism effects
  11. 11. HENDERSON MOUNTAIN, COOKE CITY, MT February 4, 1992
  12. 12.  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 An aerial view of the San scale Andreas fault in the Carrizo Plain, Central California
  13. 13. An earthquake is a violent shaking of theground. Sometimes it is so strong that theground splits apart.When parts of the earth, called plates,move against each other giant shockwaves move upwards towards thesurface causing the earthquake.
  14. 14. Global Earthquake Locations
  15. 15. Earthquakes
  16. 16. Natural Disasters Earthquakes2004 West coast of Sumatra(Indonesia),9.1 Magnitude, 227.898 People died
  17. 17. Natural Disasters Earthquakes2008 Eastern Sichuan (China)7.9 Magnitude, 87.587 People died
  18. 18. Natural Disasters Earthquakes2010 Haiti,7.0 Magnitude, 222.570 People died
  19. 19. Natural Disasters Earthquakes1999 Gölcük / Kocaeli,7.8 Magnitude, 17.480 People died
  20. 20. I believe that earthquakes is the worst natural disaster to experience. Destruction
  21. 21. Scientists haven’t find out when earthquakes going to happen and still working on it.
  22. 22. Earthquakes that has a magnitude of 6 or higher could be deadly and could be a major earthquake.
  23. 23. Earthquakes could cause buildings and objects to collapse and take many, many lives.
  24. 24. - The shaking, rolling or sudden shock of the Earths surface. - Usually last for less than one minute. - Effects very large areas.Mike-Campbell, “Badly Damaged building in the CBD” September 6, 2010 via Flickr. Creative Commons - Earthquakes are veryAttribution and No Derivative Works License. unpredictable.
  25. 25. SeismographSigns of an earthquake:- The ground shakes. - Shelves begin to shake.- Objects begin to sway. -There is a slight rumble sound. The Richter Scale (0-9)Under 4= little to no damage, Above 6=major damage
  26. 26. What to do in an earthquake:1. Drop to the floor.2. Find cover under table or in a doorway.3. Hold on through the shaking.4. Remain where you are until told all is safe.
  27. 27. • 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 Click on Image to View• Tornados are most common in a Tornado Chaser’s the United States, just east of Video the Rocky Mountains in an area called Tornado Ally• Waterspouts are weak tornados over water and can move inland and become tornados
  28. 28.  Tornadoes can happen when there is a thunderstorm. The color of tornadoes ranges from shades of gray, shades of brown, and white. Some times they are not that visible to see. A tornado is a dangerous rotating column of air which is connected to the surface of the earth and a clod. It destroys anything it touches in its path. Tornadoes are extremely destructive funnel-shaped rotating column of air that passes in a narrow path over land. Tornadoes can come in many sizes and shapes. The usual shape of a tornado is a funnel, which is seeable and is narrow end touches the earth’s surface.
  29. 29. - Funnel-shaped clouds thatdevelop mostly duringthunderstorms.- Speeds can reach 300 mph.- Damage can be up to 1 mile wide and 50 miles long.
  30. 30. Tornado Alley:IowaSouth DakotaNebraskaColoradoKansasOklahomaTexas
  31. 31. On the News:Tornado Watch: Tornadoes are possible,continue on as normal, but stay tunedin for updates.Tornado Warning: A tornado has beenspotted, take appropriate cover.
  32. 32.  Tornados can occur almost anywhere in the world Duration: a few minutes Diameter (Avg.): 0.4 km Length of path (Avg.): 6 km Funnel can travel from 0 mph up to ~70 mph, usually travels at 30 mph 99% of all tornados in Northern Hemisphere rotate counterclockwise Texas is #1 for frequency of tornados per year Between 1950 and 1995 Texas had 5,722 recorded tornados Risk of death in a tornado in Texas: 1 in 1,054,267 Texas cost per person per year for tornados: $3.94
  33. 33.  Anytime of the year- usually in the spring, summer, and fall Most tornados occur during late spring in the month of May Between the late afternoon and early evening is when most tornados are spawned The most dangerous time for formation during evening hours A typical late afternoon tornado
  34. 34. A 20-ton trailer blown off A pick-up truck caught inU.S. 30; it bounced 5 the path of a tornadotimes Tornados mainly cause damage by picking up something and throwing it through the air or hurling objects against something
  35. 35. A Cyclone is a fierce storm with storm windsthat spin around it in a giant circle. During acyclone trees can be uprooted, buildingscan be destroyed and cars can beoverturned.
  36. 36.  They are powerful, spinning storms which form over warm tropical waters and reach wind speeds over 120 km/hr. When it moves and crosses over land, it brings with it heavy rain and high velocity winds.
  37. 37.  Torrential rain that can cause flooding Extremely strong winds that carry debris that can be lethal Damage buildings and property Destroy crops Capsize boats at sea Deaths due to drowning Infrastructure destroyed
  38. 38.  A cyclone is a large-scale storm system with heavy rain and winds that rotate counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere around and toward a low pressure center. Cyclones have also been seen on other planets other then the Earth, such as Mars, and Neptune. Some deadly cyclones that happened before are the Bhola cyclone in Bangladesh in 1970, the India cyclone in India in 1839, the Calcutta cyclone in India in 1737, and the Bangladesh cyclone in Bangladesh in 1991.
  39. 39.  http// Church C., Burgess D., Doswell C., Davies-Jones,R., ed. The Tornado: Its Structure, Dynamics, Prediction, and Hazards. American Geophysical Union Press: 2000 Liu, Henry. Calculation Of Wind Speeds Required to Damage or Destroy Buildings. Publication within The Tornado•••••••••••••••••••