Monday’s magnitude 5.2 temblor marked another success for California’s earthquake early warning system, with users in some areas saying they received alerts on their phones before they felt shaking.

Most Californians know that sinking feeling. The ground shakes, jolting you to attention. For a split second, your mind considers the possibilities: A truck driving by? Someone dropping a heavy object ...

Nearly 40,000 people have signed a petition "urgently" calling for officials to create an early warning siren system for the flood-ravaged Texas hill country. The Change.org petition, created by ...