3.4 quake hits Ontario area; felt in San Bernardino | The BriefBrief
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Event Brief

3.4 quake hits Ontario area; felt in San Bernardino

Filed: Sep 02, 2026 at 10:00 AM ET
Summary: A 3.4-magnitude earthquake struck the Ontario area Wednesday morning, according to the U.S. Geological Survey. Shaking was felt across San Bernardino County, prompting reports of noticeable tremors in the region.
WHO: U.S. Geological Survey (USGS)
WHAT: A 3.4-magnitude earthquake rattled the Ontario area; shaking was felt across San Bernardino County.
WHEN: Sep 02, 2026 at 9:46 AM ET
WHERE: San Bernardino County, California
WHY: Cause not yet established.
ℹ️ This event is analyzed using pattern arcs, velocity indicators, and source analysis in our MI Console.

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