2. The preparedness of the community for a
natural disaster
Efforts of community during a natural
disaster
After the natural disaster
Role of youth after a natural disaster
3. Planet Earth’s heat flow causes movement of
lithospheric plates, which causes faulting,
which
causes earthquakes. Earthquakes often
occur when tectonic plate collide.
What is an earthquake ?
4. What happens when plates collide? It
depends how the plates are moving when
they meet:
1. When two plates collide head-on, they
push each other up and form mountains.
That's how the Himalayas and other great
mountain ranges were created.
5. 2. When one plate dives below another
plate, it creates a seduction zone as the
diving plate is crushed and melted. This
process often creates volcanoes as the
magma rises up to the surface.
6. 3. When two plates slide past each other,
they create a transform fault, like the San
Andreas fault.
7. Earthquake is an event which
is –
-generally unpredictable
-happens instantly or without giving enough time to
react
-affecting a large number of people
-disrupting normal life and leading to a large scale
devastation in terms of loss of life and property
-always finding the administration and affected
people struggling to respond in the desired
manner
-leaving deep socio-psychological,
political and economic after effects
which persist for a long time to come.
8. Aftershock
An earthquake of similar or lesser intensity that follows the
main earthquake.
Magnitude
The amount of energy released
during an earthquake, which
is computed from an amplitude
of seismic waves. A magnitude
of 7.0 on the Richter Scale
indicates an extremely strong
earthquake.
10. Before an earthquake:
Prepare a disaster preparedness kit.
Have an emergency evacuation plan.
Anchor heavy objects and potential falling
hazards. (bookcases, wall units, etc.)
Know emergency telephone numbers.
11. During an earthquake:
Stay calm.
If inside: stand in a doorway or crouch
beside a desk or table.
If outside: stand away from buildings, trees,
telephone, and electrical lines.
If on the road: drive away from underpasses
and overpasses; stop in a safe area, stay in
between vehicles or between sturdy
furniture.
12. After an earthquake:
Check for injuries and provide first aid.
Do a safety check: check for gas, water,
downed power lines and shortages.
Turn off appropriate utilities; Check for
damage.
Turn on the radio and listen for instructions
on safety or recovery actions.
Use the telephone for emergencies only.
13. Earthquake waves are known as seismic
waves. There are three
main types of seismic
waves. Each type of
wave has a speed
and manner of travel.
Seismic waves
14. This is an image of a seismograph,
an instrument used to record the
energy released by an earthquake.
When the needle is moved by the
motion of the earth, it leaves a
wavy line.
15. Blue primary waves followed by red secondary
waves move outward in concentric circles
from the epicenter of an earthquake off
British Columbia and Washington State.
