USGS: 8.0 M earthquake struck off Alaska, Tsunami alert issued - BBC

According to the US Geological Survey (USGS), an earthquake of 8.0 magnitude struck 300km south-east of Kodiak at a depth of 10km at 09:31 GMT.

Key Details via BBC:

The US National Weather Service said the alert was in effect for areas including California and the coasts of British Columbia and Alaska.

The alert told people to seek refuge on higher grounds in affected areas.

The NWS Pacific Tsunami Warning Center said that, based on the preliminary earthquake parameters, "widespread hazardous tsunami waves were possible.