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

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?

If you noticed the earthquake, you can share your observations using the USGS Felt Report form.

Tremors past week

Over the last week, there have been three tremors of magnitude 2.5 or above centered nearby. The largest, measuring 3.0, shook 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