An earthquake struck the bay area at 8:04 p.m. Tuesday night.

It had a magnitude of 5.6 on the Richter scale, according to the U.S. Geological Survey. The epicenter was 5 miles north of the Alum Rock area of San Jose.

The shaking in the Oakland area and surroundings was categorized by the survey as “weak” to “light.”

“There have been no reports of any casualties or damage,” said Carieann Bedwell, a geophysicist at the geological survey.

She said that the temblor was felt as far north as Fresno.

Although Oakland is vulnerable, as the largest city on the Hayward fault, only 20 percent of Oaklanders are prepared for a disaster, according to Renee Domingo, director of emergency services for the City of Oakland.

But earthquakes like Tuesdays do motivate people to get trained, she said.

“Anytime there’s anything close to home, people call. It definitely raises the level of awareness,” she said.

For more information on how to prepare for an earthquake or other emergency, contact C.O.R.E.