An earthquake with a preliminary magnitude of 7.5 struck off Alaska on Monday afternoon, the US Geological Survey said.

Following the temblor, US authorities issued a tsunami alert for coastal areas of Alaska and the Aleutian Islands, but later downgraded it to an advisory. There were no immediate reports of damage or injuries.

The Japan Meteorological Agency also reported the quake but that any potential tsunami will not affect the country.

The focus of the quake, which occurred at around 12:54 p.m. local time, was about 91 kilometers southeast of Sand Point along the Alaska Peninsula at a depth of around 40.1 km, according to the USGS.