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Earthquakes

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thames thames

on 10 May 2015

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Transcript of Earthquakes

Earthquakes
Ambika Singh
Introduction
There are many natural calamities that occurs on our planet and affects plants, animals and humans. Here are some examples:-
Earthquakes
Floods
Cyclones
Volcanoes
Tsunami
and some more................
Earthquake
Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake.

When two blocks of rock or two plates are rubbing against each other, they create a tremor that we feel on the surface.
Where are earthquakes found ?
Most earthquakes occur along the fault line.

A fault is a thin zone of crushed rock separating blocks of the earth's crust.
How do we measure earthquake?
The size of an earthquake, usually expressed by the Richter Scale, is a measure of the elastic waves. The moment size of an earthquake is a measure of the amount of energy released - an amount that can be estimated.
Effects of earthquake
Although probably the most important, direct shaking effects are not the only hazard associated with earthquakes, other effects such as landslides, liquefaction, and tsunamis have also played important part in destruction produced by earthquakes.
Preparedness for earthquake
The real key to surviving an earthquake and reducing your risk of injury lies in
planning
,
preparing
, and
practicing
what you and your family will do if it happens.
Example:
1. We should know all the emergency exits of our building and quickly evacuate in case of earthquake.
2. We should stay away from tall buildings and trees.
Earthquake in Nepal
Recent earthquake in Nepal was a big disaster. Around 7,903 died in Nepal. Millions of people are homeless now and relief operations are ongoing.

Its really sad to see the suffering.
Tectonic plates are pieces of the Earth's crust and uppermost mantle, together referred to as the lithosphere.

Photo of children in evacuation drill
Kathmandu
Full transcript