Japan quake
People stand outside after evacuating buildings in Tokyo's financial district in Tokyo after an earthquake. Reuters

A strong earthquake with a magnitude of 6.8 jolted eastern and northeastern Japan on Sunday, according to the U.S. Geological Survey. However, there were no immediate reports of injuries or damages, and no tsunami warning was issued.

The earthquake measured 4 in central Tokyo, Fukushima, and their surrounding areas on the Japanese intensity scale, which measures ground motion, according to the Japan Meteorological Agency, which uses a different measuring system than the USGS.

A Tokyo Electric Power Co. representative said there were no reports of any abnormalities at the tsunami-crippled Fukushima Daiichi nuclear plan following the quake.

Some high-speed train services in northern Japan were suspended after the earthquake, but soon resumed operations, Kyodo news reported.

The earthquake, at a depth of nearly 217 miles, was recorded off Japan's southeastern Izu islands on Sunday at 2:28 p.m. local time (5:28 GMT), the USGS reported.

The Hawaii-based U.S. Pacific Tsunami Warning Center has not issued a tsunami warning following the earthquake located south-southwest of Hachijo-jima in the Izu islands.

Earthquakes are common in Japan, one of the world's most seismically active areas. The country accounts for about 20 percent of the world's earthquakes of magnitude 6 or greater.

Last March 11, the northeastern coast was struck by a magnitude-9.0 earthquake, the strongest quake in Japan on record, and a massive tsunami, which triggered the world's worst nuclear crisis in 25 years since the Chernobyl disaster in the former Soviet Union.

The March disaster resulted in 23,000 dead or missing.

(Singapore world desk, additional reporting by Taiga Uranaka and Kiyoshi Takenaka)