TOKYO (AP) _ A moderate earthquake with a preliminary magnitude of 4.7 shook Japan's northernmost main island today. There were no immediate reports of damage or injuries.

The tremor was centered 43 miles below ground in eastern Hokkaido, 580 miles northwest of Tokyo, the Meteorological Agency said.

The agency said there was no fear of tsunami, seismic waves caused by undersea disturbances such as volcanic activity or earthquakes.

A quake of magnitude 4 can shake houses and buildings and cause hanging objects, such as lamps, to swing.