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San Francisco, CA – Earthquake activity increased across California on Saturday, with at least seven earthquakes recorded statewide and a notable swarm near the San Francisco Bay Area, according to data from the U.S. Geological Survey (USGS) and the California Integrated Seismic Network (CISN).
According to USGS records, the most concentrated activity occurred near San Ramon in Contra Costa County, where five earthquakes ranging from magnitude 2.5 to 4.0 struck late Friday night into early Saturday morning. The strongest quake, a magnitude 4.0, was recorded approximately 5 kilometers south-southeast of San Ramon at a depth of about 9.6 kilometers. Several smaller quakes followed within a short time window, meeting the definition of an earthquake swarm…