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Q70 (CDS-I/2012) Geography › World Physical Geography › Seismology and volcanism Answer Verified

Which one among the follow- ing is not correct regarding Tsunami ?

Result
Your answer: —  Â·  Correct: D
Explanation

Tsunamis are characterized by extremely long wavelengths, often exceeding 500 km [4]. In the deep ocean, they have a very small amplitude, typically around 0.3 to 0.6 meters (roughly 12 inches), making them nearly imperceptible to ships [6]. As they approach shallower water, the shoaling effect causes the wave speed to decrease and the amplitude to increase significantly, sometimes reaching heights of 20 to 30 meters [2]. Regarding their generation, tsunamis are triggered by sudden water displacement from earthquakes, landslides, volcanic eruptions, or meteorite impacts [4]. While they are colloquially called 'tidal waves', oceanographers discourage this term because tides do not play a role in their generation [3]. Tides are caused by the gravitational pull of the moon and sun, whereas tsunamis are seismic or displacement-driven events.

Sources

  1. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 15: Tsunami > Normal Waves vs Tsunami Waves > p. 192
  2. [4] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 17: Contemporary Issues > Tsunami > p. 15
  3. [5] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Encountering a Tsunami > p. 34
  4. [6] https://www.noaa.gov/explainers/science-behind-tsunamis
  5. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 15: Tsunami > Normal Waves vs Tsunami Waves > p. 193
  6. [2] Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 8: Natural Hazards and Disaster Management > Characteristics of Tsunami Waves > p. 33
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