More than three dozen aftershocks, ranging up to a magnitude 4.9, have been registered following a 5.7 earthquake about 150 miles northeast of Sacramento, officials said.
The first quake struck at around 8:47 p.m. Thursday; its epicenter was about 27 miles southwest of the town of Susanville and seven miles west northwest of Greenville, according to the U.S. Geological Survey.
Officials in Susanville and Sacramento said the quake set off a number of home and car alarms and rattled windows, but there were no immediate reports of damage.
Within minutes of the first quake, more than 7,000 people reported feeling it on the USGS website.
A Chico resident told The Times he felt a slow roll that lasted about 30 seconds.
Dozens of smaller earthquakes followed in the Greenville area, including a magnitude 3.5 temblor at 8:55 p.m., a magnitude 4.9 at 1:02 a.m. Friday, and a magnitude 2.5 at 5:36 a.m., according to the USGS.
"House shook pretty hard," one man near Truckee told The Times.