A second aftershock in two days shook Alaska’s largest city Wednesday afternoon. 

The temblor, with a preliminary magnitude of 4.2 which was still fluctuating under review, struck about 3:16 p.m. 8.6 miles southeast of Anchorage according to the U.S. Geological Survey. It was relatively shallow, at a depth of 10.1 miles.

Later Wednesday afternoon, the magnitude was updated to 3.9.

On Tuesday night, a 4.5 quake struck east of Big Lake at 8:41 p.m. That quake was one of the many aftershocks from the Nov. 30 7.0 quake which rocked the region.

Editor's note: After the magnitude of Wednesday's aftershock was updated to 3.9, a sentence referring to it being the 40th aftershock of magnitude 4.0 or higher was removed. 

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