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

The tremor shook at 12:19 a.m., with its epicenter situated roughly 1 mile southeast of Danville and a depth of 5 miles.

Did you feel it?

Those who noticed the earthquake are encouraged to report it via the USGS Felt Report form.

Tremors last week

In the past week, three tremors of magnitude 2.5 or higher have been recorded in the area. The strongest, a 3.0 magnitude quake, struck 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