Tokyo, Jan. 6 (Jiji Press)--A series of powerful earthquakes struck western Japan on Tuesday, measuring up to upper 5, the fourth-highest level on the country's seismic intensity scale, in the western prefectures of Tottori and Shimane. According to the Japan Meteorological Agency, a quake with an estimated magnitude of 6.4 occurred at a depth of 11 kilometers in eastern Shimane at around 1...