On Monday morning, San Ramon experienced at least eight significant and minor earthquakes, including a notable 4.3 magnitude tremor that occurred at approximately 7 a.m. This quake reverberated throughout the Bay Area, reaching cities as far away as San Francisco and Livermore.
Prior to the larger quake, two additional quakes measuring 3.7 and 3.3 in magnitude struck around 6:30 a.m. Several smaller tremors, registering around 2.0, were also recorded shortly afterward. Many residents reported feeling the quakes, with over a dozen individuals from San Ramon and Pleasant Hill contacting local news station KTVU to describe the intense shaking. The KTVU studios in Oakland also experienced the quake’s effects.
Local residents shared their experiences on social media, recounting vivid moments of the quakes. Evan Li from San Ramon captured a video showing his paperclips and change shaking on a table. Miranda Harmon-Smith commented on Facebook about her house creaking in Brentwood while her cat jumped unexpectedly. Others, like Tina Hernandez-Romo, mentioned that their beds shook in nearby Cherryland, while numerous reports came from San Francisco, Livermore, Orinda, and other surrounding areas.
San Ramon has become a focal point for moderate seismic activity, particularly along the Calaveras Fault—a known creeping fault. This type of fault is characterized by a slow movement that gradually releases stress through numerous smaller to moderate earthquakes, which fits the pattern of swarm behavior. On occasion, accumulated stress may culminate in quakes reaching the 4.0-magnitude range.
According to the United States Geological Survey (USGS), there have been roughly 300 earthquakes recorded in the San Ramon area since December 1, 2025. The recent activity includes at least two other quakes reported on Friday and an additional quake nearby in Dublin, underscoring the region’s seismic volatility. Despite the disturbances, the occurrence of minor quakes can serve as a reminder of the earth’s dynamic nature and the ongoing research efforts to understand and predict seismic activity.