More than 30 earthquakes hit Southern California town on Friday

A swarm of small earthquakes struck the Riverside County city of Glen Avon on Friday, according to the U.S. Geological Survey (USGS).

The quakes began shortly after midnight, at 12:21 a.m. with a 0.9 magnitude tremor, according to the Southern California Earthquake Data Center at the California Institute of Technology. It was recorded three miles north-northwest of Glen Avon at a depth of about 1.6 miles.

The largest quake hit the area around 6:39 a.m. approximately two miles north-northwest of Glen Avon. The quake registered a magnitude of 2.9, at a depth of about 1.5 miles.

As of 1 p.m., 30 small earthquakes were reported in Glen Avon on Friday. Most of the quakes fell below 2.0, meaning that many of them were likely too light to be felt.

Dr. Lucy Jones, a seismologist with USGS, said on Twitter that this is not uncommon for the area. "When it has quakes, they are usually in clusters like this," Jones said. "In other words, ordinary, common California quakes."

There were no immediate reports of damage. While there are many variables involved, geologists say damage does not usually occur until the earthquake magnitude reaches somewhere above 4 or 5.

USGS provides information about earthquakes by state and preparedness information, including helpful information for those in California.