A 3.4-magnitude earthquake, now the largest temblor in a recent swarm of small shakers around the East Bay, was recorded Thursday morning near San Ramon, according to the U.S. Geological Survey.
The earthquake, which was reported at 6:10 a.m., was first classified as having a 3.2-magnitude, but it has since been upgraded, USGS officials said.
People felt shaking as far north as Vallejo and as far south as Sunnyvale, according to the USGS.
Then between 9:30 and 10:30 a.m. Thursday, there were five earthquakes of imperceptible magnitude that the USGS reported around San Ramon.
Within the past week, the USGS has reported 45 total earthquakes in San Ramon or nearby. Fifteen of those earthquakes were reported above a magnitude of 2.0.
The swarm's second-largest reported earthquake, after Thursday morning's temblor, was a 3.1-magnitude earthquake reported early Wednesday morning in San Ramon, according to the USGS.