California-Nevada Quake

USGS deletes 5.9 quake in Nevada

Nevada earthquakes? USGS sent an alert but here's what really happened

A shake alert went out over the U.S. Geological Survey's early warning system on Dec. 4, warning that a 5.9 earthquake near Carson City in western Nevada could produce heavy shaking in the region.

NBC Los Angeles on MSN · 1d

Magnitude-5.9 Nevada earthquake notification was false alert, USGS says

· 2d

Magnitude 5.9 earthquake shakes Nevada, can be felt in California

· 1d

USGS says Nevada quake report was false, blaming automatic system's error

The United States Geological Survey said on Thursday that its automatic earthquake detection system had erroneously sent out a report earlier in the day that a 5.9 magnitude earthquake had struck near...

· 2d

‘Incorrect’ USGS alert of 5.9 magnitude earthquake being investigated

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Alert and story on Nevada earthquake withdrawn after USGS reports system error

KTVU FOX 2 on MSN

USGS deletes 5.9 quake in Nevada from its website

The Shake Alert seismology team said they are now working to review the data, but that it appears the faulty alert might've been caused by a software error.

KQED

False Earthquake Alert Likely Triggered by ‘Something Out in the Field,’ USGS Says

“On December 4, 2025, the ShakeAlert EEW system released an incorrect alert for a magnitude 5.9 earthquake near Reno and Carson City, Nevada,” the statement read. “The event did not occur, and has been deleted from USGS websites and data feeds. The USGS is working to understand the cause of the false alert.”