An earthquake with a magnitude of 4.2 hit near Isleton, California, on Wednesday morning, the United States Geological Survey said.
The quake struck about 2.7 miles southwest of Isleton just before 9:30 a.m. USGS reported its depth as 6.7 miles. USGS downgraded the quake from a preliminary magnitude of 4.6 to 4.1 before revising it up slightly again.
There were no immediate reports of damage in Isleton or elsewhere.
Isleton city manager Chuck Bergson said Delta levees appeared sound, though a recent study indicated that some south of the town could use upgrades because of their age.
“There was nothing major with this one,” he said.
He described feeling rumbling at City Hall during the quake.
An alert was sent to people’s cellphones across the area. The quake comes one day ahead of the planned Great California Shake Out drill to raise awareness about earthquake safety.