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Earthquake By Nupur Deshpande

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Earthquake

By Nupur Deshpande

What is an ‘earthquake’?• Used to describe both sudden slip on

a fault, and the resulting ground shaking and radiated seismic energy caused by the slip

• Caused by volcanic or magmatic activity,

• Caused by other sudden stress changes in the earth.

Three Types of Faults

Strike-Slip Thrust

Normal

What causes earthquakes?• Tectonic plates move past each other

causing stress. Stress causes the rock to deform– Plastic deformation – does not cause

earthquakes– Elastic deformation – rock stretches then

reaches a breaking point, releasing energy.

Elastic Rebound – deformed rock goes back to its original shape

Focus – point inside the Earth where an earthquake beginsEpicenter – point on Earth’s surface above focus

Global Earthquake Locations

Comparing Seismic Waves

Typical Seismogram

How Seismographs Work

the pendulum remains fixed as the ground moves beneath it

Conclusion• Earthquakes can’t be predicted.• In earthquake-prone areas people

live in earthquake-proof houses and buildings.

• Whenever there is a shake, we must take shelter and hold a strong thing for support like door or table and be away from things that can fall on you.

Scientists are researching for a technology that can predict earthquake and also prevent them.

Thank You

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