An earthquake with a preliminary magnitude of 6.7 has hit Japan’s northeastern region, prompting a tsunami advisory from the Japan Meteorological Agency (JMA).

The earthquake struck on Friday off the coast of Aomori Prefecture at 11:44am local time (02:44 GMT) at a depth of 20 km (12.4 miles), according to the JMA.

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The United States Geological Survey (USGS) also said that the quake measured 6.7.

Japan’s Nuclear Regulation Authority said there were no immediate signs of abnormalities at the region’s nuclear facilities.

National broadcaster NHK said that the level of shaking from the quake was less than a bigger magnitude 7.5 earthquake that hit in the same region on Monday and tore apart roads, smashed windows and triggered tsunami waves of up to 70 centimetres (almost 1 foot).

Following Monday’s quake which injured at least 50 people, the JMA issued a rare special advisory warning to residents across a wide area, from Hokkaido in the north to Chiba, east of Tokyo, to be on alert for an increased possibility of a powerful earthquake hitting again within a week.

The northeast region is haunted by the memory of a massive magnitude 9.0 undersea quake in 2011 , which triggered a tsunami that left around 18,500 people dead or missing.