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SAN RAMON, Calif. (AP) — The San Francisco Bay Area experienced a sequence of minor earthquakes on Monday morning, adding to the region’s recent surge in seismic activity.
The largest tremor of the day registered at a magnitude of 4.2, occurring just after 7 a.m. near San Ramon, as reported by the U.S. Geological Survey.
Beginning around 6:30 a.m., over a dozen smaller tremors shook the area, persisting for more than an hour.
No significant damage was immediately reported. However, Bay Area Rapid Transit cautioned that train services might face delays due to reduced speeds during standard track inspections to ensure safety.
The shaking extended over 30 miles (48 km) away, reaching San Francisco and spreading across East Bay cities such as Oakland and Richmond.
San Ramon has been shaken by multiple recent earthquakes. The Contra Costa County area recorded 87 quakes at magnitude 2 or above in November and December, according to a San Francisco Chronicle analysis of USGS data last month.
The area has a history of earthquake swarms, when quakes repeatedly strike a small area, and don’t follow a typical mainshock-aftershock sequence, according to seismology experts.