A minor, 3.1-magnitude earthquake struck in the San Francisco Bay Area on Thursday, according to the United States Geological Survey. The temblor happened at 6:54 a.m. Pacific time about 15 miles northeast of Alum Rock, Calif., data from the agency shows.

Many of the state’s largest earthquakes have struck near the junction, where the Pacific, North American and Gorda plates meet. This area also forms the boundary between two infamous threats: the San Andreas Fault system, which runs across most of California, and the Cascadia subduction zone, which goes up to Vancouver Island, Canada.