SAN FRANCISCO >> An earthquake registering a magnitude of 3.7 shook part of the San Francisco Bay Area and people reported feeling a quick jolt. There were no immediate reports of injuries or major property damage.

The United States Geological Survey said the earthquake was detected at 7:02 a.m. Friday about 3 miles northwest of San Francisco with a depth of 12 miles.

A magnitude 2.5 aftershock centered in the same area on the San Andreas fault occurred at 9:39 a.m. and a magnitude of 3.0 at 10:48 a.m. Friday, according to the USGS.

People posted on social media that they were awakened by a quick, sharp motion.

Mayor Daniel Lurie said first responders were checking for any damage.

The San Andreas fault has long been considered one of the most dangerous earthquake faults.