The USGS has recorded nearly 70 aftershocks since Tuesday's quake centered in Lamont, mostly measuring between 2.0 to 4.0 magnitude.
Among the biggest were a 4.4 in the Grapevine area at 7:09 p.m. on Wednesday and a 3.8 that hit Wednesday at 4:43 p.m. near Lamont.
There were no immediate reports of damage from the aftershocks.
Tuesday's quake resulted in significant shaking throughout the region, with some products falling off store shelves, but no major structural damage or injuries.
The Kern County region has been prone to quakes for decades, seismologist Lucy Jones noted on Tuesday. A massive 7.5 magnitude quake there in 1952 resulted in a higher frequency of earthquakes for decades that were seen as aftershocks.
Kern County's 7.5 magnitude earthquake in 1952 led to changes in earthquake policies