Overview
- USGS logged a magnitude 3.8 quake at about 9:38 a.m. near San Ramon, followed within minutes by quakes of 3.7, 3.0 and 2.9.
- Later events included a 2.5 just before 10:20 a.m. and a preliminary 3.2 at 10:42 a.m., extending the morning sequence.
- Preliminary analyses place the shaking at a shallow depth of roughly 5.4 miles, with figures subject to refinement as data are reviewed.
- Residents reported light to weak shaking in San Ramon, Dublin, Danville and Pleasanton, according to USGS ‘Did You Feel It’ responses.
- Magnitude readings varied slightly across agencies, with IRIS listing the strongest at 3.7 and EMSC at 3.6, as monitoring continues for updates.