Japan was jolted by a strong earthquake close to its northeast coast on Monday, which prompted the authorities to issue a tsunami alert.

The tremors were measured to be of 7.6 magnitude on the Richter scale, according to an initial update shared by the Japan Meteorological Agency.

The earthquake was reported close to Japan’s Aomori prefecture at around 11:15 p.m. local time. The tremors erupted from a depth of 50 km, the country’s official weather agency said. There were no immediate reports on damages or casualties.

The tsunami warnings have been issued for Japan’s northern prefectures of Aomori, Hokkaido and Iwate, Bloomberg News reported.

The country’s meteorological agency has warned that tsunami waves of up to 10 feet, or around three metres, could hit the regions where the warning has been sounded.

The strong earthquake sparked concerns over the safety of nuclear power plants in the region. However, Japanese news agency Kyodo reported, citing officials, that there were no issues at the Fukushima and Higashidori nuclear plants.