That rumbling you felt a little after midnight today was an earthquake - but a small one.

The magnitude 3.2 quake in the Oakland Hills was felt up to Richmond and out to Walnut Creek, with some of the strongest shaking experienced just east of Oakland, according to the U.S. Geological Survey.

No injuries or damage were reported during the seismic event, which occurred at 12:13 a.m. It was centered just west of Joaquin Miller Park, less than a mile from the 4.2 magnitude quake that rattled Bay Area resident's nerves on July 31. That quake caused some minor damage at homes and businesses in Oakland and Berkeley but caused no injuries.

El Carmello Circle, just off Monterey Boulevard, was the exact epicenter of today's quake, the USGS reported.

Most people reported weak or light shaking, according to the USGS.