A powerful earthquake struck off Japan’s northern coast on Thursday, but the country’s meteorological agency said there was no danger of a tsunami, AP reported. 

Kyodo news agency reported that at least four people were injured.

The quake had a magnitude of 7.2 and occurred off the eastern coast of Iwate, upgraded from an initial reading of 6.9, the Japan Meteorological Agency said.

The quake had a depth of about 50 kilometers (30 miles), it said.

The rattling occurred in an area where strong earthquakes have repeatedly been reported in recent months, including one that triggered a weeklong mega-quake caution advisory in December.

The quake, which struck Japan’s northeastern region during Thursday’s morning rush hour, also mildly shook Tokyo, according to AP.