Multiple small earthquakes struck Monday morning, centered near San Ramon, according to the United States Geological Survey. The first temblor, a 2.9 magnitude, was reported at 2:33 a.m. and centered about 2.5 miles southeast of San Ramon, the USGS said.

A minor, 3.6-magnitude earthquake struck in the San Francisco Bay Area on Monday, according to the United States Geological Survey. The temblor happened at 9:07 a.m. Pacific time about 2 miles southeast of San Ramon, Calif., data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 3.7.

A 3.7 earthquake rattled San Ramon on Monday morning, following several earlier small quakes in the area, according to the U.S. Geological Survey. These come after a cluster of earthquakes in the last few weeks.

The swarm of quakes rattling the Bay Area follow about 90 tremors which struck last month in the Alamo, Gilroy and San Ramon areas.

Robert DeGroot, operations team lead for the USGS-managed ShakeAlert Earthquake Early Warning System, told SFGATE that at least four sensors across Nevada detected motion, leading to an automated warning sent out via MyShake Alert to a large portion of California.

Did you feel them? Several earthquakes struck south of the Bay Area on Black Friday. The strongest quake was a magnitude 3.4, according to the USGS, but came after two days of similar sized earthquakes in the area of Gilroy and San Juan Bautista.