5.0 magnitude earthquake hits Tokyo and eastern Japan, third in 4 days
Aerial view shows reactor buildings in Japan Reuters

A 4.9 magnitude earthquake shook buildings in Tokyo on Wednesday, according to the US Geological Survey (USGS).

However, there were no immediate reports of injuries or damage and the authorities said there was no threat of tsunami.

Japan is located at the junction of four tectonic plates and earthquakes are quite common in the country. The country sits on one of the world's most seismically active zones. 

Reports show that Japan accounts for about 20 percent of the world's earthquakes of magnitude 6 or greater.