N early 75% of the country is at risk for a potentially ... deadly Northridge earthquake in Los Angeles, the most recent major quake to hit the U.S. T ools like the USGS map are used to ...

A light, 4.1-magnitude earthquake struck in Southern California on Sunday, according to the United States Geological Survey.

READ MORE: World's largest earthquake ... so very low tsunami threat," he reassured. The USGS isn't batting an eyelid either, declaring, "Large earthquakes at this location of the plate boundary ...

the first earthquake occurred around 9:44 a.m. about three miles northeast of San Bernardino followed by another at 9:48 a.m. A USGS map showed shock waves reached areas of Fontana, Redlands ...