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Small Earthquake, Aftershocks Shake California's Napa Region

The 3.9-magnitude earthquake near American Canyon early Tuesday was accompanied by at least three aftershocks — two days after a major quake hit.

A 3.9-magnitude earthquake and a series of aftershocks shook southern Napa County early Tuesday, the U.S. Geological Survey reported. There were no immediate reports of injuries or damage although it rattled the same region rocked by a 6.0-magnitude earthquake early Sunday. This latest one struck just after 5:30 a.m. PT near American Canyon, with a 2.7-magnitude aftershock hitting a couple of minutes later. Another aftershock — a magnitude 2.8 — struck around 6:12 a.m. PT, followed by a magnitude 3.0 about a half-hour later, the U.S. Geological Survey said.

There have been at least 65 aftershocks in the heart of California wine country since Sunday’s quake — the largest in the Bay Area since the 6.9-magnitude temblor in 1989. Most of the recent aftershocks have been less than a magnitude 3.0. Meanwhile, areas hit by the Sunday quake are awaiting a disaster declaration from the Obama administration to help affected residents and businesses get relief aid.

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— Hallie Jackson and Erik Ortiz