After a magnitude-2.8 quake hit San Ramon at 9:33 p.m. Monday, more rattlers hit the area along the Calaveras Fault, according to the United States Geological Survey.
Twitter user Joel Speck said he felt a “good earthquake” at his home on O’Connor Boulevard near Highway 114, which is five miles from the reported epicenter.
A swarm of earthquakes continued to rock San Ramon in the East Bay. Besides Monday afternoon’s temblor, two others quakes were above magnitude 3.0.
While not huge, the number of earthquakes hitting each day is rattling nerves.
The earthquakes have some residents concerned over whether it is a sign that a larger quake is on it’s way but according to USGS this is normal for the area and is not a precursor to a “big one”. The first quake was later determined to measure magnitude 2.8, USGS officials said.
There have now been more than 200 quakes in the past week.
There have been no reports of damage.
Californians prepared for future earthquakes during the annual the Great California ShakeOut drill of 2015 last week.