A small earthquake shook parts of the Inland Empire Sunday night, and residents from across the region reported hearing loud booming sounds before feeling the small rumble.
A preliminary magnitude-3.1 earthquake struck about 3 miles southeast of Rancho Cucamonga about 10:59 p.m., according to the US Geological Survey.
"(The quake) sounded like a train coming, and then a quick shake," NBC4 viewer Kristin Chapman said. "The sound of it scared me more."
Residents reported feeling the quake across the Inland Empire, including in Alta Loma, Azusa, Chino, Eastvale, Fontana and Riverside.
"It was loud, and I thought it was thunder," NBC4 viewer Tere Nelson said. "Then the rumble, and I knew it was a quake."
Other viewers described the quake as making their home feel like "it was on rollers" and making a "big popping sound" in their house.
"(We) definitely heard before we felt (it)," viewer Simone Pascual said via Facebook.