In San Ramon, Rachael Heys was woken up by the 4.2 magnitude quake, which she said was one of the biggest she’s felt in a long time. “This is getting really scary,” Heys said after another quake, which registered at magnitude 3.8, occurred just before 7:30 a.m. The other quakes ranging from magnitude 2.5 to 3.8 occurred around Alcosta Boulevard, south of Bollinger Canyon Road. They likely originated along the Calaveras Fault, which produced another swarm of earthquakes in San Ramon in December. “This has been an absolutely crazy hour,” Mona Epstein, another San Ramon resident, said after the initial flurry of quakes.

Source: The Guardian February 03, 2026 12:30 UTC