June 20 (Bloomberg) -- An earthquake with a preliminary magnitude of 4.8 jolted Tokyo and surrounding areas of eastern Japan at 6:47 this morning, the Japan Meteorological Agency said. No tsunami warning was issued.

The tremor was centered 80 kilometers (50 miles) underground in Chiba, east of Tokyo. It registered 3 on the Japanese agency's seismic intensity scale, the agency reported on its Web site.