Three earthquakes struck Contra Costa County within the span of 15 minutes this afternoon, according to the U.S. Geological Survey.
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.
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.