Rahul Somvanshi
A magnitude 3.4 earthquake struck near Ontario in San Bernardino County, California, at 5:37 a.m. on September 2, 2026. The tremor occurred about 3.7 miles southeast of Ontario at a shallow depth, causing light shaking felt across the Inland Empire, including areas near Pomona and Riverside County. There were no immediate reports of serious injuries or structural damage.
This is what that magnitude actually means for you. A magnitude 3.4 earthquake is relatively small, although the shaking experienced at the surface can vary by location. Some people several miles away might feel nothing while others nearby feel noticeable tremors. The key factor isn’t just the magnitude number—it’s also how deep the earthquake occurred and how far you are from the center.
The common assumption that small earthquakes mean no damage is wrong. A small-magnitude earthquake does not guarantee that damage is impossible; damage depends on factors including distance, depth, construction and local ground conditions. The shallow depth of this earthquake meant shaking could be stronger at the surface than it would have been for an otherwise similar earthquake occurring much deeper.
People across the region used the USGS “Did You Feel It?” system to report their experiences. The reports help scientists map how shaking was experienced at different locations and improve understanding of earthquake effects.
If you felt the earthquake, here’s what actually works: Drop to your hands and knees immediately. Take cover under a sturdy desk or table, or against an interior wall if nothing is available. Hold on until shaking stops. Don’t run outside during shaking; falling objects, glass and exterior building elements can create hazards. That doorway myth? It’s outdated. Modern doorways aren’t particularly safer than other indoor locations and don’t protect you from falling objects.
Aftershocks can follow an earthquake, and authorities may issue aftershock forecasts after larger events. Keep water, non-perishable food, and a flashlight accessible. California residents can use compatible earthquake-alert services that receive ShakeAlert warnings.
This earthquake is a reminder to secure heavy furniture to walls and know your building’s safest spots. The Earthquake Country Alliance and FEMA have specific guidance for different situations: if you’re in bed when shaking starts, stay there and cover your head. If you’re driving, pull over safely and stay inside your vehicle. If you’re in a high-rise, stay away from windows and exterior walls.
