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What is earthquake? Discuss focus/ hypoc...

What is earthquake? Discuss focus/ hypocentre and epicentre. How do we measure its magnitude and intensity?

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An earthquake is shaking of the earth. It.s a nature event. It is caused due to release of energy, which generates waves that travel in all directions.
(i) Focus/Hypocentre: The point where the energy is released is called the focus/ Hypocentre of an earthquake. (ii) Epicentre: The point on the surface which is nearest to the focus of energy is called epicentre. It is the first one to experience the waves. It is a point directly above the focus. Measurement of earthquake:
(a) Magnitude: It is measured by Richter Scale
(b) Intensity: It is measured by Mercalli Scale.
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