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Q33 (CDS-II/2026) Geography › World Physical Geography

Consider the following statements with reference to earthquakes :
1. Collapse earthquakes are most common
2. Tsunamis are waves generated by the tremors and not an earthquake in itself
3. High magnitude earthquakes i.e. 8+ are quite rare whereas 'tiny' types occur almost every minute
Which of the statements given above are correct ?

Result
Your answer: —  ·  Correct: C

Explanation

Statement 1 is incorrect: Tectonic earthquakes are the most common type of earthquakes, caused by the movement of crustal blocks along fault planes. Collapse earthquakes are localized and occur in areas of intense mining activity when underground roofs cave in.

Statement 2 is correct: A tsunami is not an earthquake; it is a series of water waves generated by the displacement of a large volume of water. While often triggered by undersea earthquake tremors, the tsunami itself is a secondary effect.

Statement 3 is correct: Earthquake frequency decreases as magnitude increases. According to the USGS, great earthquakes (magnitude 8.0 or higher) occur about once a year, while millions of very small or "tiny" earthquakes occur annually, effectively happening almost every minute globally, though many are too small to be felt by humans.

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SIMILAR QUESTIONS

CDS-I · 2025 · Q1 Relevance score: 2.65

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 ?

NDA-I · 2024 · Q109 Relevance score: 2.03

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 :

CDS-II · 2016 · Q14 Relevance score: 1.72

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.

IAS · 2001 · Q59 Relevance score: 1.62

Consider the following statements regarding the earthquakes : I. The intensity of earthquake is measured on Mercalli scale. II. The magnitude of an earthquake is a measure of energy released. III. Earthquake magnitudes are based on direct measurements of the amplitude of seismic waves. IV. In the Richter scale, each whole number demonstrates a hundredfold increase in the amount of energy released. Which of these statements are correct ?