Twenty medium intensity earthquakes hit the Andaman and Nicobar islands in a span of 11 hours on Monday, according to the National Centre for Seismology.
All the tremors were of magnitude between 4.5 and 5.5, the NCS said.
The first quake with a magnitude of 4.9 occurred at 5.14 AM, followed by another with a magnitude of 5, a couple of minutes later.
The last jolt was recorded at 3.44 PM with a magnitude of 4.8, it said.
The Andaman and the Nicobar archipelago is prone to earthquakes.
It is also not unusual for the islands to witness more than two-three quakes a day.
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