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Q109 (NDA-I/2024) Geography › World Physical Geography Official Key

Which of the following statements regarding earthquakes is/are correct ? 1. The point on the Earth's surface directly above the focus is called the epicentre of the earthquake. 2. Earthquakes generate Primary and Secondary waves that radiate outward from the earthquake focus. 3. Deep-focus earthquakes are likely to cause more damage than shallow-focus earthquakes. Select the answer using the code given below :

Result
Your answer: —  Â·  Correct: B
Explanation

The correct answer is Option B (1 and 2 only) based on the following geographical principles:

  • Statement 1 is correct: The point within the Earth where the earthquake energy is released is called the focus (or hypocenter). The point on the Earth's surface directly above the focus is the epicenter, which usually experiences the strongest shaking.
  • Statement 2 is correct: Earthquake energy travels as seismic waves. Body waves, which include Primary (P) and Secondary (S) waves, originate at the focus and radiate outward through the Earth's interior.
  • Statement 3 is incorrect: Shallow-focus earthquakes (0-70 km deep) generally cause much more damage than deep-focus earthquakes. This is because the seismic energy has a shorter distance to travel to the surface, resulting in higher intensity and greater impact on structures compared to deep-focus quakes, where energy dissipates significantly before reaching the surface.
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SIMILAR QUESTIONS

NDA-I · 2023 · Q58 Relevance score: 5.62

Which of the following statements is/are correct ? 1. Hypocenter is the point on the surface of the Earth, nearest to the focus. 2. Velocity of earthquake waves is higher in denser materials. 3. P waves move faster and are the first to arrive at the surface of the Earth. Select the correct answer using the code given below :

CDS-II · 2016 · Q14 Relevance score: 4.98

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-I · 2014 · Q93 Relevance score: 4.97

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.

NDA-I · 2025 · Q103 Relevance score: 2.76

Which of the following statements with reference to L-Wave or Long Wave generated by an earthquake is/are correct ? 1. They follow the Earth's circumference 2. They travel at more or less at a constant rate Select the answer using the code given below :

CDS-I · 2025 · Q1 Relevance score: 2.55

Consider the following statements with reference to Secondary waves (S-Waves) generated during an earthquake : 1. They create troughs and crests in the material through which they pass. 2. The direction of vibrations of S-waves is perpendicular to the wave direction in the vertical plane. Which of the statements given above is/are correct ?