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

Presentation on natural disasters by the students of Iqra University ( Gulshan Campus)
Published on: Mar 3, 2016
Source: www.slideshare.net


Transcripts - Natural disasters ppt by muzzammil ghayas

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

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