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The strong earthquake-cum-tsunami which has moved Japan's main island by a few feet and has caused the Earth's axis to wobble is expected to lead to the shortening of the day by :
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- 1.6 microseconds
- 2.3 microseconds
- 3.1 microseconds
- 3.4 microseconds
Correct Option: A
The earthquake-cum-tsunami packed such fury that it has moved Japan’s main island, Honshu, by about 8 feet. It’s also caused the Earth’s axis to wobble by about4 inches something that experts say will lead to the shortening of the day by 1.6 microseconds, or just over a millionth of a second. These very tiny changes happen because of changes in the speed of rotation of the Earth as surface mass gets shifted around in earthquakes.
