What to know about earthquake early warning systems (opens original article in a new tab)

Earthquake early warning systems are deployed globally, with some countries using advanced technologies like Japan's S-Net and Google's Android system to alert people before shaking begins, though warning times depend on proximity to the epicenter.

• Earthquake early warning systems (EEW) are used in multiple countries including the US, Japan, Mexico, and others.
• Google Android Earthquake Alerts provide warnings through crowdsourced data from cellphones, even in countries without national EEW systems.
• Warning times vary based on proximity to the epicenter, with closer areas receiving shorter or no warnings.
• Japan's S-Net system uses underwater sensors to detect quakes and tsunamis, offering increased warning times compared to other systems.