Japan being one of the world's most seismically active areas, earthquakes are very common here. Today an earthquake with a preliminary magnitude of 6.9 struck deep under the seabed off the coast of Japan south of Tokyo. The quake's epicenter was near the Ogasawara islands south of Tokyo at a depth of about 480 km below the seabed.  There were no immediate reports of damage of property or loss of life. There was also no issue of tsunami warning.