Earthquake Early Warning

Earthquake Early Warning (EEW) aims to provide warning that shaking from an earthquake is expected before it actually arrives. EEW can be used to protect vulnerable infrastructures using automated shutdown procedures, and to save lives if the general public is notified about imminent strong ground shaking and trained to respond appropriately. EEW is not earthquake prediction, as the earthquake has already begun. In normal cases, EEW can only provide up to a handful of seconds warning time.

Figure: the principles of Earthquake Early Warning.