Didn't the Japan early warning system work pretty well? I'd say it was an improvement that wouldn't have been possible without increased abilities over the decades.
Those warn of an actively occurring earthquake. They don't predict an upcoming one.
Ah okay I see the distinction, that makes sense. We can give advance warning better than we used to but not predict the actual impetus.
Yeah it is a cool system, but it only works well depending on your location in regards to the sensors that detect the earthquake. That determines whether you will have seconds or up to a minute of time to react. If you are closer to the epicenter than the sensors, then you will probably feel the tremors before the warning gets to you.