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I also highly recommend the Global Disaster and Alert Communication System set up by the UN and European Commission. Their ranking of orange vs red level events tends to map pretty well to how serious the event is in terms of destruction.

http://www.gdacs.org/

The consolidation and eventual application of data generated by government agencies like the USGS should be at least someone's goal, maybe the US Digital Service. Although probably not as big an issue in the continental United States as elsewhere, a 21st-century augmentation to traditional warnings of earthquakes/floods/tornadoes should be a thing if it isn't already.

Signed up, and even an hour later haven't got the confirmation link by email. Not very reassuring for an 'Earthquake Notification Service'.

Same here...