| Consider the following statements about Tsunami, a Japanese word, which means harbour waves. |
| 1. Tsunami waves originate in the oceans only due to earthquakes that occur on the oceanbed. |
| 2. To generate Tsunami waves, there should be vertical displacement of water column, which happens in the case of strike slip fault. |
| 3. As the Tsunami waves travel over a shallow and gradual slope, its wavelength decreases. This is called 'shoaling effect'. |
| Which of the statements] given above is/are correct? |
A) 1 and 2
B) 1 and 3
C) Only 3
D) 2 and 3
Correct Answer: C
Solution :
[c] Oceanbed earthquakes are not the only reason for generating Tsunami. Volcanic eruptions and other underwater explosions (including detonations of underwater nuclear devices), landslides, glacier calvings, meteorite impacts and other disturbances above or below water, all have the potential to generate a Tsunami. To generate Tsunami, there should be vertical displacement of water column, which happens in the case of thrust fault. Strike slip faults do not generate Tsunami. When a Tsunami wave travels over a shallow and gradual slope, its wavelength decreases and it allows for the Tsunami to grow in wave height. This is called shoaling effect. It causes huge damage along the shallow coasts.
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