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Q89 (CDS-II/2022) Geography › World Physical Geography › Seismology and volcanism Answer Verified

Which one of the following is the other term used for 'Focus' in relation with an earthake?

Result
Your answer: —  Â·  Correct: A
Explanation

In seismology, the 'focus' of an earthquake refers to the specific point within the Earth's interior where the sudden release of energy occurs and seismic waves originate [2]. This point is also technically known as the hypocentre [2]. While the focus (hypocentre) is located at depth within the crust or mantle, the point on the Earth's surface directly above it is called the epicentre [2]. Most earthquakes have a shallow focus, typically occurring at depths less than 60 km, though deep-focus earthquakes can occur much further down in subduction zones [2]. The term 'isocentre' is not a standard seismic term for focus, though 'isoseismic lines' refer to lines connecting points of equal intensity [1]. Therefore, 'hypocentre' is the correct alternative term for the focus of an earthquake.

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 14: Earthquakes > Focus and Epicentre > p. 177
  2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 17: Contemporary Issues > Earthquakes > p. 8
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