Earthquake rattles Northern California near Sacramento, triggering ShakeAlert. Here’s what we know

This is a developing story; check back with sacbee.com for updates.

A small earthquake rattled the Sacramento-San Joaquin River Delta region of Northern California on Wednesday morning, prompting a widespread early warning and shaking residents near Isleton but apparently causing no damage.

The 4.1-magnitude temblor struck Brannan Island, 5 miles south-southwest of Isleton, a tiny Sacramento County city along the river, according to the U.S. Geological Survey. The epicenter was located near Jackson Slough Road and was 31 miles south of Sacramento.

“There was no damage, just normal right now,” said Thirak Chiv, owner of the Rio Vista Bakery and Grill, where the shaking was felt for five of six seconds. “It did shake a lot, but OK now so far.

“I don’t see anything damaged.”

Martha Esch, owner of the Lockeport Grill and Fountain, said she was sitting in her van at the B & W Resort Marina in Isleton when the quake hit.

“I was sitting in my van, no one around me and I thought that someone had bashed into the back of my van,” she said. “It shook back and forth several times.

“I got out of my van and looked around and there was no one there. And then the young woman came out of the snack bar looking really scared and said, ‘Oh, my God.’

“I have never felt an earthquake in the Delta in the 32 years I’ve lived here. It was exciting, especially since no one bashed into the back of my van. I hate to say it but it was fun.”

The Sacramento County Office of Emergency Services says were no reports of damage in the area, but officials are working to assess levees in the area.

Matt Robinson, a spokesman for Sacramento County OES, said road crews doing general work in the area have not seen any damage, and that OES was working with a patchwork of reclamation districts to check the levees that shake through the area.

Chelsea Davis, 22, was working the snack bar at the B & W Resort when she felt the quake.

“I’ve never felt anything like that before,” she said. “Usually, whenever an earthquake has hit we’re in the outer part of it.

“I feel like this was the first earthquake I’ve ever experienced like this.”

Davis said there was no apparent damage, although some fliers tacked to the wall fluttered to the floor.

“We’re in an older building so it was shaking super crazy,” she said.

Davis initially thought somebody was breaking into the store before she realized it was an earthquake when she saw the tackle moving.

“I was by myself,” Davis said, adding that she initially froze until a woman came in to get her out of the building. “She was such a sweetheart.”

A ShakeAlert was triggered for just before 9:30 a.m.

Weak and light shaking was self-reported through the USGS’ website. By 10 a.m., more than 1,100 people said they had felt little to no shaking in parts of Placer, Sacramento, San Joaquin, Alameda, Contra Costa, Napa, Marin, San Francisco and San Mateo counties, according to the USGS.

Earthquakes are uncommon but not unusual for the Delta, which has seen more than 100 earthquakes in the upper portions of the Sacramento-San Joaquin system since 1965, though most where magnitude 3 or less.

Besides Wednesday’s quake, there have been only three other events in the past 60 years that were greater than magnitude 4.

The largest was a magnitude-4.9 temblor that struck around the Antioch area on Sept. 10, 1965.