Humboldt County earthquake puts California's early warning system to the test
Valley Public Radio
December 22, 2022, 10:48 am
As sensors picked up the first signs of a strong earthquake jolting the Northern California coast, an alert was blasted to 3 million smartphone users telling them to “drop, cover, hold on.” It was hailed as the biggest test yet of the warning system since its public launch.
ScienceAndTechnology