Natural Disasters<br />Group Members:-<br />Tahira Jabbar Shaikh (4377)<br />Shahid  Hussain (4422)<br />Sana Laiq Ali (43...
Disaster:-<br /><ul><li>An occurrence causing widespread destruction and distress.
A catastrophe.
A grave misfortune.</li></ul>Definitions<br />
<ul><li>A natural disaster is an event caused by natural forces.
It often has a significant effect on human populations.
Typically the human populations either are displaced (left homeless) or killed.</li></ul>Natural Disasters<br />
<ul><li>Have economic and emotional effect on people.
Directly affect life and property.</li></ul>Contd…<br />
Natural disasters occurs in all three broad<br />areas:<br /><ul><li>Land
Air
Water</li></ul>Occurrence & Affects of Natural Disasters<br />
There are 4 kinds of natural disasters which<br />occurs on land:<br /><ul><li>Earthquakes
Volcanic Eruptions
Lahars
Avalanches</li></ul>Disasters on Land<br />
<ul><li>Earthquake is a sudden shock of earth’s crust.
The underground point of origin is called the focus.
The point directly above the focus is called the epicenter.
They are measured with a seismometer.
The scale is called the Richter Scale.</li></ul>Earthquakes<br />
<ul><li>An earthquake that occurs after the main shock.
It occurs in the same area or region of the main shock.
Its magnitude is relatively smaller than the main shock.</li></ul>The Aftershocks<br />
If the magnitude of an after shock is greater<br />than the main shock:<br /><ul><li>After shock is designated as the main...
The main shock is redesignated as the fore shock.</li></ul>Designation of Main Shock & The After Shock<br />
<ul><li>Earthquake itself does not kill any one.
Usually the secondary events kill the people.
Secondary events include:
Tsunami
Building Collapse
Fires
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Natural disasters ppt by muzzammil ghayas

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Presentation on natural disasters by the students of Iqra University ( Gulshan Campus)

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Natural disasters ppt by muzzammil ghayas

  1. 1. Natural Disasters<br />Group Members:-<br />Tahira Jabbar Shaikh (4377)<br />Shahid Hussain (4422)<br />Sana Laiq Ali (4384)<br />Kamran Mehmood (4424)<br />Muhammad Muzammil Ghayas (4338)<br />Course Instructor:-<br />Miss Mehvish Saleem<br />
  2. 2. Disaster:-<br /><ul><li>An occurrence causing widespread destruction and distress.
  3. 3. A catastrophe.
  4. 4. A grave misfortune.</li></ul>Definitions<br />
  5. 5. <ul><li>A natural disaster is an event caused by natural forces.
  6. 6. It often has a significant effect on human populations.
  7. 7. Typically the human populations either are displaced (left homeless) or killed.</li></ul>Natural Disasters<br />
  8. 8. <ul><li>Have economic and emotional effect on people.
  9. 9. Directly affect life and property.</li></ul>Contd…<br />
  10. 10. Natural disasters occurs in all three broad<br />areas:<br /><ul><li>Land
  11. 11. Air
  12. 12. Water</li></ul>Occurrence & Affects of Natural Disasters<br />
  13. 13. There are 4 kinds of natural disasters which<br />occurs on land:<br /><ul><li>Earthquakes
  14. 14. Volcanic Eruptions
  15. 15. Lahars
  16. 16. Avalanches</li></ul>Disasters on Land<br />
  17. 17. <ul><li>Earthquake is a sudden shock of earth’s crust.
  18. 18. The underground point of origin is called the focus.
  19. 19. The point directly above the focus is called the epicenter.
  20. 20. They are measured with a seismometer.
  21. 21. The scale is called the Richter Scale.</li></ul>Earthquakes<br />
  22. 22. <ul><li>An earthquake that occurs after the main shock.
  23. 23. It occurs in the same area or region of the main shock.
  24. 24. Its magnitude is relatively smaller than the main shock.</li></ul>The Aftershocks<br />
  25. 25. If the magnitude of an after shock is greater<br />than the main shock:<br /><ul><li>After shock is designated as the main shock.
  26. 26. The main shock is redesignated as the fore shock.</li></ul>Designation of Main Shock & The After Shock<br />
  27. 27. <ul><li>Earthquake itself does not kill any one.
  28. 28. Usually the secondary events kill the people.
  29. 29. Secondary events include:
  30. 30. Tsunami
  31. 31. Building Collapse
  32. 32. Fires
  33. 33. Volcanoes</li></ul>Earthquakes does not Kill People<br />
  34. 34. <ul><li>A volcano is an opening in earth’s crust.
  35. 35. It allows hot magma, ash and gasses to come out from below the surface.
  36. 36. They are generally found where tectonic plates are diverging or converging.</li></ul>Volcanic Eruptions<br />
  37. 37. <ul><li>Volcanoes can be destructive.
  38. 38. Can be harmful for the life and property.
  39. 39. Icelandic volcanic eruption continued for nearly 3 months.
  40. 40. Caused thousands of</li></ul> flights to be cancelled.<br />Contd…<br />
  41. 41. <ul><li>A type of mudslide/landslide composed of pyroclastic material & water.
  42. 42. It is liquid while moving and becomes solid when the activity is stopped.
  43. 43. Can flow 100 km/hour.
  44. 44. Can cover a distance of more than 300 km.
  45. 45. Can be deadly due to their energy & speed.
  46. 46. Killed 23000 people in Armero , Columbia in 1985.</li></ul>Lahars<br />
  47. 47. <ul><li>An avalanche is a rapid flow of snow down a slope.
  48. 48. Primarily composed of flowing snow.
  49. 49. It occurs in mountainous regions.
  50. 50. It can mix air and water with descending snow.
  51. 51. Most destructive natural disaster in the mountainous regions.</li></ul>Avalanches<br />
  52. 52. <ul><li>Wellington Avalanche (1910)
  53. 53. Blons Avalanches (1954) </li></ul>Some Notable Avalanches<br />
  54. 54. There are basically three types of natural<br />disasters which occurs in or due to the water:<br /><ul><li>Floods
  55. 55. Tsunami
  56. 56. Limnic eruptions</li></ul>Water Disasters<br />
  57. 57. <ul><li>A flood is an overflow of water.
  58. 58. They occur when the flow of water exceeds the capacity of river.
  59. 59. Heavy rain is another reason.
  60. 60. Can be destructive for life and property.</li></ul>Floods<br />
  61. 61. <ul><li>A tsunami is a series of water waves.
  62. 62. It is caused by the displacement of a large volume of a water body.
  63. 63. Caused by the underwater earthquakes, volcanic eruptions and </li></ul> underwater explosions. <br /><ul><li>Can destroy coastal areas.</li></ul>Tsunami<br />
  64. 64. <ul><li>Frequent in Japan.
  65. 65. In 2004, Indian Ocean Tsunami caused widespread destruction.
  66. 66. Hundreds of thousands of people were killed in different countries.
  67. 67. During 2nd World War, New Zealand army tried to create an artificial tsunami.
  68. 68. New Zealand army was failed to create the artificial tsunami.</li></ul>Contd…<br />
  69. 69. <ul><li>Can not be predicted correctly even if magnitude and place of quake is known.
  70. 70. Pacific tsunami warning system monitors Pacific Ocean’s seismic activities.
  71. 71. People can save their lives by going</li></ul> to the places higher than the land.<br /><ul><li>Sign boards are placed in US to </li></ul> show the people where to go.<br />Countering Tsunami<br />
  72. 72. <ul><li>A rare type of natural disaster.
  73. 73. Occurs in lakes.
  74. 74. Occurs when a gas (carbon dioxide) erupts deep under the water.
  75. 75. Large cloud of carbon dioxide forms above the lake.
  76. 76. Killed 37 people in Cameron at Lake Monoun in 1984.
  77. 77. Killed 1700-1800 people in Cameron at Lake Nyos.</li></ul>Limnic Eruptions<br />
  78. 78. Air Disasters<br />
  79. 79. Tornado<br />
  80. 80. <ul><li>A rotating column of air.
  81. 81. In contact with both surface of earth and the cloud.
  82. 82. Approximate length is 250 feet (80 m).
  83. 83. Usually wind speed is 110 miles/hour.
  84. 84. Can attain wind speed of more than 300 miles/hour.</li></ul>Tornado<br />
  85. 85. <ul><li>Multiple-Vortex Tornado
  86. 86. Water Spout
  87. 87. Dust Devil
  88. 88. Fire Whirls
  89. 89. Steam Devil</li></ul>Some Other Types of Tornadoes<br />
  90. 90. Multiple-Vortex Tornado<br />2 tornadoes moving simultaneously<br />
  91. 91. Waterspout<br />A tornado over the Water<br />
  92. 92. Dust Devil<br />A Dust Devil<br />
  93. 93. Fire Whirls<br />A tornado of fire <br />
  94. 94. Steam Devils<br />Multiple tornadoes of Smoke<br />
  95. 95. <ul><li>Humans can not control the nature.
  96. 96. Better understanding of natural disasters and causes can help us in minimizing the damage.
  97. 97. By proper disaster management thousands of lives can be saved.</li></ul>Conclusion<br />
  98. 98. Q & A<br />

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