Overview

• The U.S. Geological Survey recorded a magnitude 4.2 quake at a shallow depth of 3.3 miles near Rialto at 9:32 a.m., followed minutes later by a magnitude 3.1 aftershock.
• Residents in Fontana, Jurupa Valley, Eastvale, Ontario and Redondo Beach reported feeling the shaking as a sharp jolt or rolling motion.
• No damage or injuries have been reported and local emergency services confirmed that infrastructure remained intact.
• In the ten days before July 31, the Rialto area experienced three earthquakes of magnitude 3.0 or greater.
• California and Nevada average about 25 earthquakes between magnitudes 4.0 and 5.0 each year, underscoring the need for continued preparedness.