ONTARIO, California — A magnitude 3.4 earthquake struck near Ontario early Wednesday morning, with residents reporting shaking across parts of San Bernardino County and the wider Inland Empire.
The earthquake occurred at approximately 5:37 a.m. PDT on September 2, 2026. Preliminary data published by the U.S. Geological Survey placed the epicentre about 6 kilometres southeast of Ontario.
The quake originated at a depth of approximately 3.8 miles, or 6.1 kilometres. Its relatively shallow depth helped make the shaking noticeable in nearby communities, although there were no immediate reports of injuries or significant structural damage.
People in the Fontana and Chino areas told local media that the tremor woke them from sleep. Shaking was also reported by residents in Ontario and other parts of the Inland Empire.
Where was the Ontario earthquake felt?
The epicentre was recorded southeast of Ontario, close to several populated communities in Southern California. According to the Southern California Earthquake Data Center, the earthquake was located approximately:
- 3 miles southeast of Ontario
- 4 miles east-southeast of Mira Loma
- 6 miles east of Chino
- 6 miles north-northwest of Norco
- 6 miles west of Glen Avon
The earthquake was identified as event ci41540608. It struck at exactly 5:37:12 a.m. PDT, corresponding to 12:37:12 p.m. UTC.
Initial reports described the earthquake as magnitude 3.4. However, earthquake measurements can be revised as seismologists process additional information. A reviewed Southern California Earthquake Data Center report subsequently displayed a local magnitude of 3.2, while the USGS event listing continued to identify it as magnitude 3.4 at the time of publication.
The Ontario tremor follows other recent seismic activity in the region. Swikblog previously reported on earthquakes near Redlands in San Bernardino County, where residents also reported feeling noticeable shaking.
Were any injuries or damage reported?
No injuries, major damage or service disruptions were immediately reported following Wednesday morning’s earthquake. Authorities had not announced any road closures, building evacuations or emergency operations connected to the tremor.
Residents who felt the earthquake can submit a report using the “Did You Feel It?” section on the official USGS event page. These public reports help scientists understand how strongly an earthquake was felt across different locations.
California emergency guidance advises people to Drop, Cover and Hold On when shaking begins. People indoors should stay away from windows, take cover beneath sturdy furniture and avoid running outside while the ground is moving.
After an earthquake, residents should check for fallen objects, damaged utility connections and possible gas leaks. Anyone who smells gas should leave the building immediately and contact emergency services or the appropriate utility provider from a safe location.
Households are also advised to maintain an emergency kit containing drinking water, non-perishable food, essential medication, flashlights, batteries, a radio and basic first-aid supplies.
Developing story: This report will be updated if authorities confirm damage, injuries, additional earthquakes or revised seismic measurements.
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