A magnitude 3.7 earthquake struck San Francisco Friday evening, with an epicenter beneath the city’s international airport, the United States Geological Survey said.
The earthquake struck about eight miles under the airport at 6:38 p.m. local time, the USGS said. There were no immediate reports of injuries or damage at the airport or elsewhere.
Bay Area Rapid Transit, the San Francisco subway system, reduced train speed Friday evening to conduct inspections for any damage along its tracks.
For some people in the San Francisco Bay Area, the quake produced a dull thud, as if something large was hitting a nearby building.
There were no active earthquake-related travel alerts on the San Francisco International Airport website Friday around 10:30 p.m. An airport spokesperson did not immediately respond to a request for comment.
The earthquake was minor by California standards, but notable due to its location directly beneath a major airport near the San Andreas Faulta major project stretching from northern to southern California.
The airport, which handled around 20 million passengers last year, has an air traffic control tower which is designed to withstand a magnitude 8.0 earthquake.