In order for this happens, we really need an unified earthquake early warning network in entire west coast connecting from BC, Canada all the way to Mexico. It

In order for this happens, we really need an unified earthquake early warning network in entire west coast connecting from BC, Canada all the way to Mexico. It seems that all the existing systems are only regional so far. At the same time, we probably need to drastically increase the density of the seismometers. All in all, the earthquake early warning system in North America still lies far behind to say the system in Japan.