Tokyo: The tsunami threat from a powerful earthquake that struck central Japan today has "largely passed", a US agency said.
"The tsunami threat has now largely passed," the Hawaii-based Pacific Tsunami Warning Center said.
Earlier, a succession of 21 earthquakes registering 4.0 magnitude or stronger struck central Japan in just over 90 minutes,the Japan Meteorological Agency said.
The strongest jolt measured 7.6, it said. The quakes prompted tsunami warnings and authorities urged people in the area to move to higher ground.
