In Oregon the early warning system is 38% completed, it is estimated completion by 2020. “You just never know when it’s going to happen!” explains Wade Krawec. Scientists need to place dozens of sensors that detect ground movement and they are slowly testing the system.

For more info, please read the original article by KATU News:
https://katu.com/news/local/earthquake-ready-early-warning-system-update-how-to-prep-emergency-kit