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Q61 (NDA-I/2021) Geography › World Physical Geography › Seismology and volcanism Answer Verified

Point of Origin of Earthake Wave is known as

Result
Your answer: —  Â·  Correct: B
Explanation

The point of origin of an earthquake wave within the Earth's interior is known as the focus or hypocentre [4]. This is the specific location where energy is released due to the sudden displacement of the Earth's crust or fault slipping [1]. From this center of disturbance, seismic waves radiate outward in all directions [1]. In contrast, the epicenter is the point on the Earth's surface directly vertical to the focus [2]. While the focus is underground—often occurring at depths less than 60 km in the lithosphere—the epicenter is the first point on the surface to experience the seismic waves [4]. The term photosphere refers to a layer of the Sun, and a seismic zone is a broad geographic region prone to earthquakes, making 'Focus' the precise term for the point of origin [2].

Sources

  1. [1] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 17: Contemporary Issues > Earthquakes > p. 8
  2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 14: Earthquakes > Focus and Epicentre > p. 177
  3. [4] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > earthquake Disasters > p. 15
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SIMILAR QUESTIONS

CDS-II · 2016 · Q14 Relevance score: 1.74

With reference to earthquakes, which of the following statements are correct? 1. Earthquakes largely occur along the converging plate boundaries. 2. Point of origin of earthquake in lithosphere is known as focus/ hypocentre. 3. Intensity of earthquake decreases with distance from the epicentre. 4. Epicentre of earthquake always remains over continents only. Select the correct answer using the code given below.

CDS-II · 2022 · Q89 Relevance score: 0.11

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

CDS-I · 2014 · Q93 Relevance score: -0.78

Which of the following statements relating to earthquakes is/are correct? 1. The point of origin of an earthquake is called the epicenter. 2. The lines joining the places which were affected by earthquake at the same point of time are called homoseismal lines. Select the correct answer using the code given below.

CDS-I · 2010 · Q40 Relevance score: -2.04

An earthquake epicentre is the

CAPF · 2020 · Q2 Relevance score: -3.58

Two magnetic field lines produced by the same source