An earthquake on the Richter scale shook Hesperia midday on Tuesday.

The 5.4-magnitude earthquake hit at 11:42 a.m. (The quake was initially reported as 5.8 magnitude.) Quakes between 5 and 5.9 on the Richter magnitude scale are considered moderate, and occur hundreds of times each year, and typically pose no serious threat to well-designed buildings.

According to the U.S. Geological Survey, the quake's epicenter was approximately two miles southwest of Chino Hills and five miles southeast of Diamond Bar.

Beau Yarbrough can be reached at 956-7108 or at beau@hesperiastar.com.