That was a short, sharp quake! The Alaska Earthquake Center lists a preliminary magnitude of 4.2, centered 11 miles northwest of Wasilla.
Earthquakes in Southern Alaska are produced by a number of different tectonic features. The strongest earthquakes in Southern Alaska are generated by the megathrust fault that marks the contact zone between the subducting Pacific and overriding North American plates. The 1964 M9.2 Great Alaska Earthquake, which is still the second largest earthquake ever recorded worldwide, began under Prince William Sound.
Crustal seismicity in this region can be attributed to three major sources: the faults and folds of the Cook Inlet basin, the Castle Mountain Fault, and the wide band of diffuse seismicity extending from northern Cook Inlet to the Denali Fault. Mapped geological structures in upper Cook Inlet are capable of generating strong earthquakes. The April 1933 M6.9 earthquake, which caused considerable damage in Anchorage, appears to have occurred on such a structure.
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