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This channel provides notes from different major books like D.R. khullar, G.C leong etc

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Queries - @Upscgeographybot
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50+ Prelims Score Boosting Tricks (English Medium)
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50+ Prelims Score Boosting Tricks (Hinglish Medium | हिंदी माध्यम)

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HOW ARE EARTHQUAKE WAVES PRODUCED ?

#interiorofearth

◇ The abrupt release of energy along a fault (sharp break in the crustal layer) causes earthquake waves. Rock layers along a fault tend to move in opposite directions due to the force excreted on them but are held in place by counteracting frictional force exerted by the overlying rock strata.

◇ The pressure on the rock layers builds up over a period and overcomes the frictional force resulting in a sudden movement generating shockwaves (seismic waves) that travel in all directions.

◇ The point where the energy is released is called the focus or the hypocentre of an earthquake. The point on the surface directly above the focus is called epicentre. An instrument called ‘seismograph’ records the waves reaching the surface.

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50+ Prelims Score Boosting Tricks (English Medium)
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TYPES OF SEISMIC WAVES OR EARTHQUAKE WAVES.

#interiorofearth

The seismic waves or earthquake waves are basically of two types —

Body waves and

Surface waves.

@upsc_geography_notes
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50+ Prelims Score Boosting Tricks (Hinglish Medium | हिंदी माध्यम)

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BODY WAVES

#interiorofearth

Body waves are generated due to the release of energy at the focus and move in all directions travelling through the interior of the earth. Hence, the name body waves.

There are two types of body waves:-

Primary - waves.

Secondary - waves.

@upsc_geography_notes.
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WHY DO P-WAVES TRAVEL FASTER THAN S-WAVES ?

#interiorofearth

◇ P-waves are about 1.7 times faster than the S-waves.

◇ P-waves are compression waves that apply a force in the direction of propagation and hence transmit their energy quite easily through the medium and thus travel quickly.

◇ On the other hand, S-waves are transverse waves or shear waves (motion of the medium is perpendicular to the direction of propagation of the wave) and are hence less easily transmitted through the medium.

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