The location of a magnitude 7.9 earthquake that occurred at a depth of 10km at 09:31 GMT, 278km off south east of the city of Kodiak, Alaska. USGS / EPA
The location of a magnitude 7.9 earthquake that occurred at a depth of 10km at 09:31 GMT, 278km off south east of the city of Kodiak, Alaska. USGS / EPA

Tsunami warnings after 7.9 earthquake strikes off Alaska coast