Three earthquakes struck Contra Costa County within the span of 15 minutes Sunday afternoon, according to the USGS.
The first earthquake recorded at 3:01 p.m. had a preliminary magnitude of 2.5 and had a depth of 8 miles, USGS officials said.
The quake was in an area 1 mile south of Concord, 2 miles northeast of Pleasant Hill and 4 miles north-northeast of Walnut Creek, USGS officials said.
A second temblor with a preliminary magnitude of 4.0 and a depth of 9 miles was recorded soon after at 3:13 p.m. in the same area as the first earthquake, according to the USGS. This has been downgraded Sunday evening to a 3.6 magnitude quake.
The third quake occurred a minute later with a preliminary magnitude of 2.7 and a depth of 8.1 miles in the same region, USGS officials said.
The Concord quakes Sunday occurred on the Concord-Green Valley fault, one of several in the area that seismologists say are capable of producing major earthquakes. The last large earthquake on the fault happened anywhere from 200 to 500 years ago, the USGS said.
The U.S. Geological Survey's website recorded more than 4,400 reports from Bay Area residents who felt the shaking.
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Contra Costa County fire said they did not respond to any damages or injuries.
