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The tremors were felt in Tangalle, Beliatte, Ranna and Kudawella, in Sri Lanka's southern province by residents around 5.45 to 5.50 am local time, JNW news said quoting the meteorological department.
O K Dissanayake of Sri Lanka's Geological Survey and Mines Bureau said the tremors were very small and recorded at the Pallekele research station in central Sri Lanka.
He said officials have been sent to make on-site investigations and efforts were underway to find the causes of the tremor.
Dissanayake said the affected area in the Southern province of Sri Lanka was located on limestone, and such rock formations sometimes set off tremors when underground caverns collapsed.
Areas where large reservoirs have been built could also experience such disturbances, he said.
Large quakes usually happen at the edge of tectonic plates which make up the solid crust of the earth, and constantly jostle against each other.
Large earthquakes occur when pent up pressure at plate margins are r