Early morning earthquake strikes East Bay for second day in a row

For the second morning in a row, East Bay residents were jolted awake by an earthquake. The quake was centered in Piedmont, Calif. For the second morning in a row, East Bay residents were jolted awake by an earthquake. The quake was centered in Piedmont, Calif. Photo: USGS Photo: USGS Image 1 of / 13 Caption Close Early morning earthquake strikes East Bay for second day in a row 1 / 13 Back to Gallery

For the second morning in a row, East Bay residents were jolted out of bed by an earthquake.

Thursday morning's quake was mercifully a little later, at 6:11 a.m. The USGS gave it a preliminary magnitude of 3.5.

Wednesday morning's 3.4-magnitude quake hit at 4:42 a.m. Three small aftershocks followed: a 1.9-magnitude at 4:45 a.m., a 2.0 at 4:48 a.m., and a 1.1 at 8:52 a.m.

This morning's earthquake, like yesterday's shakers, was centered near Piedmont and the Oakland hills along the Hayward Fault. The USGS pinpointed the epicenter near the intersection State Route 24 and Tunnel Road.

This morning's shaker had a depth of just over 7 miles, exactly the same as the 3.4-magnitude earthquake that hit the area Wednesday.

Locals were even more stirred up on social media, spooked by eerily similar quakes on back-to-back days.

Check out some of the tweets below:

Twitter reacts to the back-to-back mornings of shaking in the East Bay. Twitter reacts to the back-to-back mornings of shaking in the East Bay. Photo: Screenshot / Twitter Photo: Screenshot / Twitter Image 1 of / 18 Caption Close Earthquake reactions on Jan. 17, 2019 1 / 18 Back to Gallery

Some noted Thursday marked the 25th anniversary of the Northridge earthquake, a 6.7-magnitude that struck the San Fernando Valley at 4:30 a.m. on Jan. 17, 1994. The massive quake killed 57 people and injured another 8,700.

There were no initial reports of damage from either Wednesday or Thursday morning's quakes. BART ran trains at reduced speeds to perform track inspections. The agency told early-morning commuters to expect 20-minute delays system-wide.

SFGATE will update this story as any additional earthquakes are felt around the Bay Area.

Read Alix Martichoux's latest stories and send her news tips at amartichoux@sfchronicle.com.