Entities
ShakeAlert
Incidents implicated systems
Incident 13032 Report
USGS ShakeAlert System Reportedly Generated False Earthquake Alert Affecting Nevada and California
2025-12-04
On December 4, 2025, the USGS's automated ShakeAlert earthquake detection system erroneously issued a report claiming a magnitude 5.9 earthquake had struck near Dayton, Nevada. The reported false alert triggered emergency warnings on cell phones in parts of California, instructing residents to take protective action. USGS officials said no earthquake occurred and are investigating whether sensor noise or other anomalies caused the system failure.
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Related Entities
Other entities that are related to the same incident. For example, if the developer of an incident is this entity but the deployer is another entity, they are marked as related entities.