A moderate earthquake registering magnitude 4.8 rattled the Tokyo area early Tuesday, but there was no danger of a tsunami, the nation's meteorological agency said.

The 6:47 a.m. quake occurred 50 miles underground in Chiba Prefecture, just southwest of Tokyo, and was felt in dozens of cities including the capital.

CountryWatch: Japan

The quake shook buildings in Tokyo but was not strong enough to cause any damage. No injuries were immediately reported.

Japan is one of the world's most quake-prone countries because of its location at the juncture of four tectonic plates, or moving slabs of the earth's outer crust.

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