Which one of the following is the other term used for ‘Focus’ in relat

Which one of the following is the other term used for ‘Focus’ in relation with an earthquake?

Hypocentre

Epicentre

Isocentre

Principal Point

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This question was previously asked in

UPSC CDS-2 – 2022

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In seismology, the ‘focus’ is the point within the Earth where an earthquake originates, i.e., where the rupture begins. Another term for the focus is ‘hypocentre’.

The ‘epicentre’ is the point on the Earth’s surface directly above the focus. The intensity of an earthquake is often highest at the epicentre.

Seismic waves radiate outwards from the focus (hypocentre). The depth of the focus below the epicentre is known as the focal depth.

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