BREAKING NEWS, 9:56 a.m.:
SOUTHERN CALIFORNIA — A magnitude 4.5 earthquake struck Southern California at 11:23 p.m. Tuesday, followed shortly by 13 aftershocks, according to the U.S. Geological Survey.
The temblor's epicenter was about 2 miles north-northeast of Yorba Linda, Calif., putting it about 29 miles east-southeast downtown Los Angeles, according to the U.S. Geological Survey.
Initially reported as a magnitude 4.4 temblor, the U.S. Geological Survey upgraded the magnitude to 4.5 on Wednesday morning, according to its website.
On the ground and in the air, firefighters checked large buildings, schools, power lines and "critical infrastructure," according to an alert from the Los Angeles Fire Department. No injuries or significant damage were reported.
In Orange County, there were .
The Long Beach Police Department reported no damage shortly after the earthquake. The department's relatively new high-rise is built on rollers.
"We definitely felt it here," said a desk officer on duty. "We rolled for awhile after it hit."
Less than an hour after the earthquake, the U.S. Geological Survey received more than 2,300 responses from people living in 401 zip codes who said they felt the earthquake. To submit your own report, click here.
The quake was felt as far north as Castaic and Lake Hughes and as far south as San Diego and El Cajon.
According to USGS data, 13 aftershocks, ranging in magnitude from 1.2 to 2.7, struck the same general area between 11:24 a.m. and 3:06 a.m. The largest aftershock hit about a minute after the initial earthquake.
The initial earthquake and its aftershocks were measured at depths ranging from 3.1 miles to 5.9 miles on the Whittier fault.
Did you feel the earthquake or its aftershocks? Vote in our poll below, and tell us where you were in the comments.
—Patch editor Nancy Wride contributed to this report.
Editor's note: This article was updated at 11:08 a.m. Wednesday to note that the earthquake's magnitude was upgrade to 4.5. Additionally, it was updated earlier to note that there were at least 13 aftershocks.