A magnitude 7 earthquake has hit the Long Beach area in California, and people in the region are calling it the biggest ever.
The Long Beach Seismic Network (LBSN) has reported an earthquake with a magnitude of 7.0.
The US Geological Survey (USGS) has recorded at least four such quakes in California in the past year.
One of them was a magnitude 5.8 quake in October that left two people dead.
The LBSN says the quake was felt as far away as Los Angeles.
People in Long Beach are still being asked to avoid the area, and some residents have even set up roadblocks to make it easier for emergency crews.
Some people in Long Island are worried that the quake will trigger landslides and damage homes.
Residents are asking that the area be kept safe and that they keep their pets indoors.
The epicentre was recorded at a depth of 5.6km.
The quake came as a series of smaller quakes hit the Pacific coast.
In December, a magnitude 6.1 quake hit the California coast, which left three people dead and one seriously injured.
The latest quake is still under investigation, but the LBSn says it is likely to be the largest in California history.
The agency says the epicentres of some quakes are as far as 5km away from the epicenter.