Tremor hits south of island , `` jolting Tokyo , '' Kyodo news agency reported . United States Geological Survey measures quake as 7.1 magnitude . Its epicenter was 188 miles ( 303 kilometers ) The U.S. Geological Service said the earthquake struck at a depth of 10 kilometers (6 miles) and was centered about 50 miles (80 kilometers) southwest of Tokyo.
Tremor hits south of island , `` jolting Tokyo , '' Kyodo news agency reported . United States Geological Survey measures quake as 7.1 magnitude . The U.S. Geological Service said the earthquake struck at a depth of 10 kilometers (6 miles) and was centered about 50 miles (80 kilometers) southwest of Tokyo.