2018 Alaska earthquake Anchorage Date January 23, 2018 Origin time 00:31:42 Alaska Standard Time (09:31:42 UTC) Magnitude 7.9 Mw Epicenter 56°02′46″N 149°04′23″W﻿ / ﻿56.046°N 149.073°W﻿ / 56.046; -149.073Coordinates: 56°02′46″N 149°04′23″W﻿ / ﻿56.046°N 149.073°W﻿ / 56.046; -149.073 Type Strike-slip Areas affected Alaska United States