earthqua k
TRANSCRIPT
![Page 1: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/1.jpg)
Earthquake
By Nupur Deshpande
![Page 2: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/2.jpg)
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.
![Page 3: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/3.jpg)
Three Types of Faults
Strike-Slip Thrust
Normal
![Page 4: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/4.jpg)
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.
![Page 5: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/5.jpg)
Elastic Rebound – deformed rock goes back to its original shape
![Page 6: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/6.jpg)
Focus – point inside the Earth where an earthquake beginsEpicenter – point on Earth’s surface above focus
![Page 7: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/7.jpg)
Global Earthquake Locations
![Page 8: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/8.jpg)
![Page 9: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/9.jpg)
![Page 10: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/10.jpg)
Comparing Seismic Waves
![Page 11: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/11.jpg)
Typical Seismogram
![Page 12: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/12.jpg)
How Seismographs Work
the pendulum remains fixed as the ground moves beneath it
![Page 13: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/13.jpg)
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.
![Page 14: Earthqua k](https://reader036.vdocuments.net/reader036/viewer/2022062503/58e5050a1a28ab2c1c8b46d3/html5/thumbnails/14.jpg)
Thank You