The most significant quake to rock the Bay Area in the last few hours was a 3.5 magnitude one at 8.19pm GMT (12.19pm local time) 2km west of wealthy district Diablo.
Two minutes afterwards, a 2.8 magnitude quake shook the ground 2km east of Danville, California.
Three small quakes – all 2.0 magnitude or less – have followed since then.
Figures from the United States Geological Survey (USGS) show 14 other small quakes shook the East Bay city from 11.39pm PST on Thursday to 4.21am PST on Friday.
No major damage was recorded but many people reported feeling the quakes in nearby cities Walnut Creek and San Ramon, and even further afield, as they occurred at a shallow depth.
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Residents from the Bay area took to Twitter to discuss the seismic activity.
News and sports anchor Larry Beil tweeted: “Whoa. A couple of serious jolts in Danville. Earthquake swarm continues. House shook twice!”
@planetmarzs wrote: “I’m Danville and literally had a panic attack from the earthquake.”
Earlier, a 3.3 magnitude quake struck Danville at 1.28pm GMT (5.28am PT) 2km east of Danville.
The area has been subject to a swarm of earthquakes this week.
Amy Vaughan, a geophysicist, told the San Francisco Chronicle: “Looking in that general region, I’m counting 55 quakes just in the last week.
“Of those, this 3.3 was the largest, but there were several in the two range and even one other at 3.0.”
The town’s Monte Vista high school was the epicentre of five tremors on Tuesday.
Where is Danville?
Danville is located in the East Bay area in Contra Costa County, California.
The 18 square mile town is located near other Bay Area cities Walnut Creek and Pleasanton.
Often referred to as the “Heart of the San Ramon Valley”, the former farming community later switched to fruits and nuts with the arrival of Southern Pacific Railroad transport link
Today, the area is popular with Silcion Valley workers.