There have been upwards of 15 tremors over the last day in East Bay, according to figures from the United States Geological Survey (USGS).
East Bay is the eastern region of the San Francisco Bay Area, home to Oakland, Danville, San Ramon and San Leandro.
Earthquake activity in the region has been extremely active over the last few days.Was the Bay Area hit by an earthquake just now?
The most recent quake to rock the Bay Area was at 4.48pm GMT (8.48am PT).Related articles
The most recent quake to rock the Bay Area was at 8.21pm GMT (12.21am PT).iPhone transfer software
Measuring 2.8 magnitude, the tremor was recorded 2km east of Danville, California.
There have been 15 quakes in the Danville area as of 9pm GMT time (1pm PT time), with five measuring above 2.5 magnitude.
Prior to that, the most significant quake for some hours was a 3.3 magnitude one, which struck at 1.28pm GMT (5.28am PT) 2km east of Danville.
USGSSan Francisco earthquake: Was Bay Area hit by earthquake just now? White dots show quake activity
Two minutes afterwards, Bay Area reporter Will Tran tweeted: “Breaking-just felt magnitude 3.5 earthquake while reporting in Danville, CA. 530am. Car rocked side to side for about two secs @kron4news.”