AutonomousMedium
USGS ShakeAlert System Reportedly Generated False Earthquake Alert Affecting Nevada and California
- Occurred
- Dec 4, 2025
- Published
- Dec 12, 2025
- Source
- AI Incident Database
Summary
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.
Developers
- United States Geological Survey (USGS)
- Berkeley Seismological Laboratory
Deployers
- United States Geological Survey (USGS)
Harmed parties
- General public
- General public of Nevada
- General public of California
- Epistemic integrity
Classification
Category confidence: 85%
Severity confidence: 90%
Rationale: Automated detection system failure caused false emergency alerts, representing a notable failure with limited physical harm.
Classifier: Qwen/Qwen3.5-35B-A3B-FP8