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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.
Natural Disasters Group
Members:- Tahira Jabbar Shaikh (4377) Shahid Hussain (4422) Sana Laiq Ali (4384) Kamran Mehmood (4424) Muhammad Muzammil Ghayas (4338) Course Instructor:- Miss Mehvish Saleem
2.
3.
A catastrophe.
4.
A grave misfortune.Definitions
5.
6.
It often has
a significant effect on human populations.
7.
Typically the human
populations either are displaced (left homeless) or killed.Natural Disasters
8.
9.
Directly affect life
and property.Contd…
10.
11.
Air
12.
WaterOccurrence & Affects
of Natural Disasters
13.
14.
Volcanic Eruptions
15.
Lahars
16.
AvalanchesDisasters on Land
17.
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.Earthquakes
22.
23.
It occurs in
the same area or region of the main shock.
24.
Its magnitude is
relatively smaller than the main shock.The Aftershocks
25.
26.
The main shock
is redesignated as the fore shock.Designation of Main Shock & The After Shock
27.
28.
Usually the secondary
events kill the people.
29.
Secondary events include:
30.
Tsunami
31.
Building Collapse
32.
Fires
33.
VolcanoesEarthquakes does not
Kill People
34.
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.Volcanic Eruptions
37.
38.
Can be harmful
for the life and property.
39.
Icelandic volcanic eruption
continued for nearly 3 months.
40.
Caused thousands of
flights to be cancelled. Contd…
41.
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.Lahars
47.
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.Avalanches
52.
53.
Blons Avalanches (1954)
Some Notable Avalanches
54.
55.
Tsunami
56.
Limnic eruptionsWater Disasters
57.
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.Floods
61.
62.
It is caused
by the displacement of a large volume of a water body.
63.
64.
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.Contd…
69.
70.
Pacific tsunami warning
system monitors Pacific Ocean’s seismic activities.
71.
72.
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.Limnic Eruptions
78.
Air Disasters
79.
Tornado
80.
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.Tornado
85.
86.
Water Spout
87.
Dust Devil
88.
Fire Whirls
89.
Steam DevilSome Other
Types of Tornadoes
90.
Multiple-Vortex Tornado 2
tornadoes moving simultaneously
91.
Waterspout A tornado
over the Water
92.
Dust Devil A
Dust Devil
93.
Fire Whirls A
tornado of fire
94.
Steam Devils Multiple
tornadoes of Smoke
95.
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.Conclusion
98.
Q &
A
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