An earthquake with a preliminary magnitude of 4.3 jolted Japan's Ibaraki Prefecture on Wednesday, the country's weather agency said. According to the Japan Meteorological Agency (JMA), the temblor occurred at 7:11 pm local time at a depth of 50 km, measuring 3 on Japan's seismic intensity scale which peaks at 7. Tremors were felt in parts of Tokyo, Xinhua news agency reported.