CONTRA COSTA COUNTY, CA — on Saturday around midnight, a preliminary 2.1 magnitude quake was detected near Danville, according to the U.S. Geological Survey.

At 12:19 a.m., the region was struck by a tremor. The earthquake struck at a depth of 5 miles, with its epicenter about 1 mile southeast of Danville.

Did you feel it?

You can let the USGS know if you experienced the quake by filling out their Felt Report form.

Tremors last week

In the past week, there have been three earthquakes with a magnitude 2.5 or above centered nearby. The largest, measuring 3.0, occurred close to 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