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By Joe Edwards, Shane Croucher, and John Feng
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A magnitude 3.3 earthquake struck the San Ramon area in California late on Sunday night, according to the U.S. Geological Survey (USGS).
The tremor struck around 2.5 miles southeast of San Ramon and had a depth of 5.2 miles. The USGS recorded the quake at 11:21 p.m. local time.
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The Context
Frequent quakes are typical in California due to its placement over multiple major fault systems, the best known being the approximately 750‑mile San Andreas Fault.
What To Know
USGS data showed that several smaller quakes occurred shortly after the initial 3.3-magnitude tremor. These included events of 2, 2.3, 1.5, 1.8 and 2.8. As of around 5 a.m. Eastern time, at least seven earthquakes had been recorded in the area.
San Ramon sits along the Calaveras Fault, a source of the area's regular seismic activity.
The city is located about 25 miles east of San Francisco in Northern California. It has a population of more than 85,000 people, according to census data.
No injuries have been reported, per ABC7, which also noted it was the most recent quake the city had faced following a series of others over the past few months.
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Newsweek previously reported that at least 19 earthquakes hit near San Ramon within hours early in February.
Data at the time showed that the events ranged from 2.5 to 4.2 magnitude in strength, at shallow depths of about 5 miles or less.
ABC7 reported at the time that these took place amid a stretch that saw more than 30 quakes.
As Newsweek noted previously, this swarm came after several weeks of spotty seismic activity in the Tri‑Valley region, including a 3.1 quake and an earlier stretch with 91 quakes of magnitude 2 and above since November 9.
What People Are Saying
Meteorologist Rob Mayeda wrote on X on Sunday: "Our San Ramon earthquake swarm is not done … preliminary magnitude 3.3 at 11:21 pm 3/1/2026."
He added in a follow-up post: "And several smaller quakes since."
What Happens Next
Locals can check USGS event pages and intensity maps to see the latest totals and reported magnitudes.
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