Magnitude 5.5 quake shakes Japan TOKYO - A magnitude-5.5 earthquake rattled Yamanashi prefecture in central Japan on Saturday morning, the Japan Meteorological Agency reported. There were no immediate reports of damage or injuries, and no tsunami warning was issued. The temblor was some 20 kilometers (12 1/2 miles) deep and hit at 7:43 a.m. local time (2243 GMT Friday), the Japanese earthquake-reporting agency said. Last year, a magnitude-9 quake on March 11 and subsequent tsunami about 140 miles (230 kilometers) northeast of Tokyo left nearly 20,000 people dead or missing. Japan is one of the most earthquake-prone countries in the world.