Two small earthquakes shook the northeast corner of Contra Costa County early Friday morning, the U.S. Geological Survey reports.
At 1:14 AM, an earthquake with a preliminary magnitude of 3.1 shook an area near Bethel Island east of Sand Mound Slough.
The quake had a depth of 6.8 miles and an epicenter located 6 miles east of Oakley and 16 miles west of Stockton, according to the USGS.
15 minutes later, at 1:29 AM, a an earthquake with a preliminary magnitude of 2.6 rattled roughly the same location
That quake had a depth of about one mile — compared with 6.8 miles for the larger tremor — and an epicenter located 6 miles east-southeast of Oakley and 17 miles west of Stockton, according to the USGS.
Bay City News contributed significantly to this report
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