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.
But moments later, the survey announced the alert, which was sent to people as far west as San Francisco, was a false alarm.
A message was quickly posted across the top of its website, saying the “ShakeAlert Earthquake Early Warning” system was incorrect in alerting for an earthquake near Carson City, Nevada at 8:09 a.m. local time…