Magnitude 3.5 earthquake shakes San Francisco Bay Area, centered near Oakland

An earthquake with a magnitude of 3.5 struck the Oakland area Monday evening. An earthquake with a magnitude of 3.5 struck the Oakland area Monday evening. Image 1 of / 27 Caption Close Magnitude 3.5 earthquake shakes San Francisco Bay Area, centered near Oakland 1 / 27 Back to Gallery

An earthquake with preliminary magnitude of 3.8 rattled the San Francisco Bay Area Monday night. The quake was later downgraded to a 3.5.

The rolling quake was centered about 2 miles east of Oakland, according to the United States Geological Survey (USGS). It struck at 7:18 p.m. There were no reports of damage or injuries.

ALSO READ: Quake shakes Giants game, fans go to bat with jokes

People from San Jose to Santa Rosa said they felt the East Bay-centered quake, according to the USGS Community Internet Intensity Map. Those near the epicenter described the shaking as "light" to "weak."

"Our house shook," said Madeline Edwards, a longtime resident of San Francisco's Sunset District.

"I'm so excited," said Zachariah Costas from his home in Corona Heights. The Google engineer, originally from Philadelphia, said he slept through the last minor quake to rock the region — a 4.5-magnitude quake centered in Berkeley — in January.

That quake struck on Jan. 4 in the middle of the night, and it shook with enough force to jolt some locals from their slumbers.

The earthquake briefly interrupted the San Francisco Giants game Monday night. NBC cameras picked up the shaking moments before the Giants' Chris Stratton threw a pitch.

Glen Park resident Roberta Guise was watching the Golden State Warriors play the Houston Rockets in Game 1 of the NBA Finals when she felt a "single thump."

"I thought the sofa had settled," she said. "Apparently not."

BAY AREA QUAKE: Will there be aftershocks and how big will they be?

Anh Le, of San Francisco, said he was using the restroom in his North Beach apartment when "the entire bathroom floor shook and rumbled," and filled with the sounds of "shaking vibrations."

"Ah, the experience and pleasures of feeling the kinetic movements and vibrations of living near the Hayward and San Andreas Faults," Le mused.

Just before 7:30 p.m., BART reported a 10-minute systemwide delay due to the earthquake.

The City of Oakland issued an AC Alert more than an hour after the earthquake subsided. No damage or injuries were reported to the city. Officials warned residents to remain alert to possible aftershocks.

Aftershocks can occur following a quake of magnitude 3.5. They are generally considered to be within a "fault length" of the original quake, meaning aftershocks could occur within 20 miles for a 20-mile-long fault. The Hayward Fault is more than 70 miles long.

Click through the above slideshow for social media reactions to the earthquake.

Michelle Robertson is an SFGATE staff writer. Email her at mrobertson@sfchronicle.com or find her on Twitter at @mrobertsonsf.