The Bay Area is still rocking after Thursday's 4.1 earthquake.
An aftershock measuring 3.8 hit along the Calaveras fault in Milpitas Friday at 11:48 a.m., the USGS said.
Similar to the 4.1 earthquake just over 24 hours before, the aftershock was fairly shallow -- 6 miles underground.
This aftershock is the strongest to hit since the Thursday temblor. At least 10 aftershocks hit following the initial jolt, ranging from 1.5, to 2.3, according to the USGS.
The Calaveras didn't sleep much Thursday night. The USGS list of recent earthquakes shows a series of aftershocks continued overnight, most measuring in the low range. All appear to be the same depth.
There were no immediate reports of damage or injury.
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View 4.1 Earthquake near Milpitas in a larger map
