An earthquake with a preliminary magnitude of 5.1 struck off the Tokara Islands in southwestern Japan, with no tsunami alert issued, the weather agency said Monday.The 6:33 p.m. temblor measured a lower 5 on the Japanese seismic intensity scale of 7 on Akuseki Island, which is part of the island chain in Kagoshima Prefecture. There have been no reports of damage so far, according to the prefectural government and police.The quake occurred west of Akuseki Island at a depth of 30 kilometers, according to the Japan Meteorological Agency.The agency has been urging residents to stay alert, as th…READ FULL ARTICLE