According to the US Geological Survey, a 5.1 magnitude earthquake shook the San Francisco bay area on Tuesday.
There were no reports of injuries or property damage at the time.
The earthquake struck at 11:42 a.m. local time, about 9 miles east of the San Jose neighbourhood of Seven Trees.
According to USGS data, it was followed by a 3.1 magnitude aftershock about 5 minutes later.
They called it a "noble earthquake" and intensity as "weak to moderate."
Around 18,000 people in the bay area and beyond felt the earthquake.
After 2014, it was the strongest earthquake in the bay area.
Dr. Jones, the founder of Dr. Lucy Jones, centre of science and society said,"It's a once-every decade or so type of event."
The earthquake warning system warned the people at least few seconds before the earthquake.
According to the state's department of conservation, approximately two or three strong earthquakes with a magnitude of 5.5 or greater are recorded in California each year, causing moderate damage to buildings and other structures.