An earthquake measuring 6 on the Richter scale struck Sunday off the east coast of Japan's main island of Honshu, according to the China Earthquake Network Center.
The epicenter, at a depth of 20 km, was monitored at 37.3 degrees north latitude and 142.6 degrees east longitude, Xinhua citied the center as saying in a statement.
Honshu, Japan's largest island, is called the mainland. Covering 60 percent of the total area of Japan, it is the seventh largest island in the world and the second most populous after the island of Java. Honshu's area is divided into five regions and contains 34 prefectures, including metropolitan Tokyo.
On Saturday, an earthquake measuring 6.0 on the Richter scale jolted the east coast of Japan's Honshu island, according to the China Earthquake Network Centre.
The epicentre, also at a depth of 20 km, was monitored at 39.4 degrees north latitude and 142.6 degrees east longitude, Xinhua quoted the centre as stating in a statement.
Friday afternoon's 9-magnitude quake in northeastern Japan set off huge tsunami waves, some as high as 10 metres, which slammed the northeastern coast and swept off everything in its path -- buildings, cars, ships and people, media reports said. The toll could go up to 10,000, a police officer was quoted as saying.