California quake puts early warning system to the test

California quake puts early warning system to the test

Republican-American
December 22, 2022, 4:01 pm
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