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Shake Alert

Earthquake Mode — A button displays text reading Earthquake Mode in an elevator in Menlo Park, California, on Nov. 22, 2025. (Smith Collection / Gado / Getty Images)

Officials investigating false earthquake alert in Northern California and Nevada

Officials said a recent false alarm issued by the region's Shake Alert system represents a unique technical error not previously seen.

Dec 5, 2025 By Sophia Fox-Sowell