An earthquake with a magnitude of 6.6 struck southwestern Japan on Monday, with no immediate reports of injury or damage, and small tsunami were observed in parts of Miyazaki and Kochi prefectures, the weather agency said.The agency opened an investigation into potential further seismic activity in the region, but concluded that the 9:19 p.m. temblor will not immediately raise the risk of a megaquake a government panel has said could occur in or near the Nankai Trough near the country's Pacific coast.The Japan Meteorological Agency launched the examination after issuing its second-ever Nank…READ FULL ARTICLE