Port Blair, Jan 17: A strong earthquake of magnitude 6 hit the seismologically prone Andaman and Nicobar Islands today, IMD report said. There was no tsunami alert issued as sea levels around the Andaman Nicobar archipelago showed no major rise, said SPS Shenoi, Director INCOIS to national media. The earthquake hit the region at 8.43 am and its epicentre was Nicobar Islands region. There were no immediate reports of loss of life or damage to property, officials said.