TOKYO, July 20 (Xinhuanet) -- An earthquake registering an estimated magnitude of 5.1 on the Richter scale shook northeasternJapan early Tuesday morning, the Japan Meteorological Agency said.

    There were no immediate reports of casualties or damage from the 5:58 a.m. (2058 GMT) quake and no tsunami tidal wave warning was issued.

    The quake measured 3 on the Japanese seismic intensity scale of7 in several locations in the southern part of Hokkaido, Japan's northernmost main island, the agency said.

    The quake's epicenter was about 110 kilometers underground in the southern Tokachi region in Hokkaido, according to the agency. Enditem