By: Isuru Parakrama Colombo (LNW): An earthquake of magnitude 5.8 of the Richter Scale has occurred in seas off Sri Lanka, revealed the Geological Survey and Mines Bureau. The reported earthquake at a depth of about 10 kilometres has occurred in the sea 1,260 kilometres south-east of the island, at around 12.59 pm today (01), according to the Bureau. Tremors in the aftershock has spread across several areas of Sri Lanka, reports added.