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San Ramon Hit by Magnitude 3.3 Earthquake Monday Night — Residents Report Weak Shaking
San Ramon, California — A magnitude 3.3 earthquake shook parts of the East Bay late Monday night, according to data from the United States Geological Survey (USGS). The quake struck at approximately 10:47 p.m., with its epicenter located near Alcosta Boulevard and Canyon Hills Road in San Ramon. The earthquake occurred at a depth of nearly 6 miles (around 9.6 kilometers).
Residents Report Light Shaking Across Multiple Cities
Initial Did You Feel It? (DYFI) responses on the USGS website show that residents in San Ramon, Pleasanton, Walnut Creek, and Danville reported feeling weak to light shaking, though no damage was reported. Many described the tremor as a brief jolt or vibration that lasted only a few seconds.
Local residents took to social media shortly after the quake, noting rattling windows and light swaying of furniture, especially in multi-story buildings. No injuries or structural damages have been reported so far.
Part of an Ongoing Seismic Pattern in the Area
Monday night’s earthquake struck close to the same location that experienced several quakes earlier this month. On November 9, the region saw a series of eight small earthquakes within a span of about three hours, the largest being a magnitude 3.8. That seismic cluster prompted many East Bay residents to express concerns about increasing underground movement.
Geologists note that San Ramon and its surrounding areas sit near the Calaveras Fault, a historically active branch of the San Andreas Fault system. Small to moderate quakes in the region are common and often occur in short sequences.
Experts: No Immediate Cause for Alarm
Earthquake specialists say that a 3.3 magnitude tremor is generally considered minor, typically causing only light shaking and no significant structural impact. However, they emphasize that such quakes serve as a reminder for residents to stay prepared.
Emergency officials recommend keeping an earthquake kit, securing heavy furniture, and having a communication plan in place for family members.
USGS Monitoring Continues
The USGS continues to monitor the area for potential aftershocks, though none have been officially reported as of early Tuesday morning. Officials say more small quakes in the coming days would not be unusual given recent activity along the fault.
Key Details at a Glance
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Magnitude: 3.3
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Location: Near Alcosta Blvd & Canyon Hills Rd, San Ramon
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Time: 10:47 p.m. Monday
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Depth: ~6 miles
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Shaking felt in: San Ramon, Pleasanton, Danville, Walnut Creek
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No damages or injuries reported
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Related activity: Multiple quakes on Nov. 9, including a 3.8 magnitude event
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