A preliminary 3.5-magnitude earthquake shook the Upland area Monday, according to the U.S. Geological Survey.
The temblor, which hit about four miles northwest of the Rancho Cucamonga area at 7:28 p.m., had recorded more than 330 responses on the USGS website from residents who said they felt it.
"I felt it too..Felt like a truck hit the side of our building," Alejandra Cervantes said on NBC4's Facebook page.
Top news of the day
Residents from Pasadena, Montclair, Ontario and beyond said they felt shaking.
"It was quite a rumble in northwest Ontario. Cats now hiding under the bed," S Kay Murphy said on NBC4's Facebook page.
There were no immediate reports of damage.