Question

why does an earth quake occur? how is it measured?​

Answer 1

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Earthquakes are recorded by a seismographic network. Each seismic station in the network measures the movement of the ground at that site. The slip of one block of rock over another in an earthquake releases energy that makes the ground vibrate. Magnitude is the most common measure of an earthquake's size.

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Answer 2

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●Below the earth's crust, the tectonic plates always push each other, and when any sudden change in their position occur, we feel the vibration as Earthquake.

●It is measured with the help of a device called Seishmograph.