An earthquake jolted Southcentral Alaska Thursday evening, with reports from KTVA viewers that it was felt across the region.

The 4.7 temblor struck at 5:33 p.m., according to the U.S. Geological Survey. Its location near Big Lake was revised to about 1.4 miles east-southeast, and 20.3 miles north of Anchorage at a depth of 31 miles.

This earthquake is a aftershock of the magnitude 7.0 quake on Nov. 30. It is the largest aftershock since New Year's Eve and the 38th of magnitude 4.0 or larger. There have been nearly 350 aftershocks greater than 3.0 and more than 6,500 total aftershocks since Nov. 30.

Melissa Frey contributed information to this story.

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