A 4.1 magnitude earthquake gave the San Francisco Bay area an early morning wake-up call Thursday. The U.S. Geological Survey said the 4:07 a.m. quake struck several miles northwest of Bay Point at a depth of 12.2 miles (19.7 kilometers).
A 1.9 magnitude aftershock quickly followed, according to CBS San Francisco. The area is about 30 miles northeast of downtown San Francisco. There were no immediate reports of damage, CBS San Francisco reported.
The USGS’ community reporting page received more than 4,400 reports within several hours. The reports came from throughout the Bay Area and east to the Central Valley. The reports generally indicated light or weak intensity. Kimberly Silvera Shaw told CBS San Francisco that she felt the jolt in Fairfield, which is about an hour from San Francisco.
Many took to Twitter to say that they’d felt the tremor. “Just experienced the second time since moving to CA when I should have been sleeping but woke up for some reason a few minutes before an #earthquake,” wrote one Twitter user.
BART said it was running trains at reduced speeds while tracks are inspected. The transit agency said riders should expect residual delays of up to 20 minutes systemwide. More information on this earthquake is available on the USGS event page.