CONTRA COSTA COUNTY, CA — According to the U.S. Geological Survey, a preliminary 2.1 magnitude quake struck near Danville at midnight on Saturday.

The tremor, which struck the area at 12:19 a.m., was centered roughly 1 mile southeast of Danville. It occurred at a depth of 5 miles.

Did you feel it?

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

Tremors past week

Over the last week, three tremors of magnitude 2.5 or higher have been registered in the area. The strongest, a 3.0 magnitude quake, rattled close to Loyola four days ago.

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