CONTRA COSTA COUNTY, CA — According to the U.S. Geological Survey, a preliminary 2.1 magnitude quake shook close to Danville on Saturday around midnight.

It was reported that a tremor struck the region at 12:19 a.m. The epicenter was situated roughly 1 mile southeast of Danville, at a depth of 5 miles.

Did you feel it?

You can let the USGS know if you noticed the earthquake by filling out their Felt Report form. So far, the agency has collected 3 online responses from individuals saying that they felt the quake.

Tremors last week

Over the last week, three earthquakes of magnitude 2.5 or higher have been registered in the area. The strongest, a 3.0 magnitude quake, struck near Loyola four days earlier.

The three largest earthquakes nearby in the last week:

• 3.0, west-southwest of Loyola on July 8
• 2.6, west-southwest of Loyola on July 8
• 2.5, southwest of Loyola on July 6

Source: The U.S. Geological Survey