The focal mechanism shows that the earthquake was a result of normal faulting.
The earthquake had a magnitude of 7.1 on the moment magnitude scale using a centroid moment tensor inversion of the W-phase. This earthquake is more similar to the 2001 Nisqually earthquake located near Tacoma, Washington, than to the 1964 megathrust earthquake. Though earthquakes are common in Alaska, they often occur out at sea. The 1964 earthquake, with a magnitude of 9.2, was the largest earthquake in American history and the second largest to ever be recorded anywhere in the world. The region has experienced severe earthquakes in the past, including several megathrust earthquakes. Near Anchorage, the plates are converging at a rate of 57 mm per year. Southern Alaska lies at the eastern end of the Aleutian Trench, where the Pacific Plate is subducting beneath the North American Plate. The National Tsunami Warning Center-itself located inside the quake zone, in Palmer, Alaska, 42 miles (68 km) northeast of Anchorage-issued tsunami warnings for nearby coastal areas, including Cook Inlet and the Kenai Peninsula, but they were lifted shortly after. The earthquake could be felt as far away as Fairbanks. It was followed six minutes later by a magnitude 5.7 aftershock centered 2.5 miles (4.0 km) north-northwest of the municipality. The earthquake's epicenter was near Point Mackenzie, about 10 miles (16 km) north of Anchorage, and occurred at a depth of 29 miles (47 km). AKST (17:29 UTC), a magnitude 7.1 earthquake hit Anchorage in South Central Alaska.
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