California's earthquake revolution: Early-warning systems make strides, issuing more than 5 million alerts
More than 5.4 million early-warning phone alerts went out Tuesday for the magnitude 5.2 quake that struck near Bakersfield in Kern County.
More than 5.4 million early-warning phone alerts went out Tuesday for the magnitude 5.2 quake that struck near Bakersfield in Kern County.